{"id":74448,"date":"2026-10-29T13:18:53","date_gmt":"2026-10-29T20:18:53","guid":{"rendered":"https:\/\/cirasync.com\/?p=74448"},"modified":"2026-10-29T13:18:53","modified_gmt":"2026-10-29T20:18:53","slug":"activesync-vs-carddav-microsoft-365-contacts","status":"publish","type":"post","link":"https:\/\/cirasync.com\/es\/blog-articles\/activesync-vs-carddav-microsoft-365-contacts\/","title":{"rendered":"Exchange ActiveSync vs CardDAV for Microsoft 365 Contacts: Which Should Enterprise IT Teams Use in 2026?\u00a0\u00a0"},"content":{"rendered":"<p><span data-contrast=\"none\">For Microsoft 365 organizations, the choice between Exchange ActiveSync and CardDAV depends on where contacts are stored, how devices are managed, and who needs access to them. Exchange ActiveSync synchronizes supported mailbox data, including personal contacts, with compatible mobile clients. CardDAV provides a way to deliver centrally managed contact directories to devices through a compatible service and client. Both approaches can support enterprise contact synchronization, depending on the organization&#8217;s requirements and infrastructure.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">The decision matters more in 2026. Exchange Online now blocks ActiveSync clients older than version 16.1, and Microsoft&#8217;s Exchange Team confirmed in August 2026 that the change is fully enforced (<\/span><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/exchange\/exchange-online-activesync-device-support-update\/4477997\"><span data-contrast=\"none\">Microsoft Tech Community<\/span><\/a><span data-contrast=\"none\">). Microsoft also lists ActiveSync, MAPI, Outlook on the web, IMAP and POP3 as the client access methods for Exchange Online mailboxes, and CardDAV is not among them (<\/span><a href=\"https:\/\/learn.microsoft.com\/en-us\/exchange\/recipients-in-exchange-online\/manage-user-mailboxes\/managing-email-apps-for-user-mailboxes\"><span data-contrast=\"none\">Microsoft Learn<\/span><\/a><span data-contrast=\"none\">). So CardDAV for Microsoft 365 contacts always depends on a separate CardDAV service.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">This guide compares both methods on the points IT teams actually decide on: what data each one moves, how it reaches iPhone and Android, who controls it, and what tends to break. It also covers a third path that many tenants already use, Outlook mobile contact sync.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Key_takeaways\"><\/span>Key takeaways<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><b><span data-contrast=\"none\">ActiveSync syncs a mailbox.<\/span><\/b><span data-contrast=\"none\"> It delivers the contacts stored in each user&#8217;s mailbox Contacts folder. It does not turn the Global Address List (GAL) into saved phone contacts on its own.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">CardDAV syncs an address book.<\/span><\/b><span data-contrast=\"none\"> It is an open IETF standard. iPhone and iPad support it natively through an MDM Contacts payload, while Android needs an app to provide CardDAV sync.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">2026 changed the baseline.<\/span><\/b><span data-contrast=\"none\"> Since March 1, 2026, Exchange Online rejects ActiveSync clients below version 16.1. Outlook for iOS and Android does not use ActiveSync and is not affected.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Match the delivery method to the environment. <\/span><\/b><span data-contrast=\"none\">Company contacts can be delivered through a mailbox-based model, where centrally managed contacts are synchronized into users&#8217; Microsoft 365 contact folders and then reach supported devices through ActiveSync or Outlook mobile, or through a CardDAV-based model such as Mobile Direct. The better approach depends on device ownership, MDM coverage, Exchange mailbox availability, supported mobile clients and how IT wants company contacts managed on the device.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_is_Exchange_ActiveSync\"><\/span>What is Exchange ActiveSync?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">Exchange ActiveSync (EAS) is Microsoft&#8217;s protocol for synchronizing a mobile device with an Exchange mailbox. Microsoft describes it as an HTTP and XML based protocol designed for high-latency, low-bandwidth networks that gives users access to email, calendar, contacts and tasks, including while offline (<\/span><a href=\"https:\/\/learn.microsoft.com\/en-us\/exchange\/clients-and-mobile-in-exchange-online\/exchange-activesync\/exchange-activesync\"><span data-contrast=\"none\">Microsoft Learn<\/span><\/a><span data-contrast=\"none\">). It is enabled by default on Exchange Online mailboxes.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"How_ActiveSync_delivers_contacts\"><\/span>How ActiveSync delivers contacts<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">ActiveSync syncs whatever is in the user&#8217;s mailbox. When the built-in Exchange account on an iPhone, or an Android mail app, connects over EAS, the contacts it receives are the ones stored in that user&#8217;s mailbox Contacts folder. On Apple devices, Exchange&#8217;s Direct Push feature delivers email, tasks, contacts and calendar events whenever a data connection is available (<\/span><a href=\"https:\/\/support.apple.com\/guide\/deployment\/dep158966b23\/web\"><span data-contrast=\"none\">Apple Platform Deployment<\/span><\/a><span data-contrast=\"none\">).<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">The Global Address List works differently. Apple devices query the Exchange GAL when a user searches Contacts or types an email address (<\/span><a href=\"https:\/\/support.apple.com\/guide\/deployment\/dep158966b23\/web\"><span data-contrast=\"none\">Apple Platform Deployment<\/span><\/a><span data-contrast=\"none\">), but that is a lookup, not a sync. A colleague who exists only in the GAL will not appear by name when they call. Our <\/span><a href=\"https:\/\/cirasync.com\/blog-articles\/gal-sync-guide\/\"><span data-contrast=\"none\">GAL sync guide<\/span><\/a><span data-contrast=\"none\"> explains this difference in detail.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"What_IT_controls_with_ActiveSync\"><\/span>What IT controls with ActiveSync<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Microsoft lists these admin controls for ActiveSync in Exchange Online (<\/span><a href=\"https:\/\/learn.microsoft.com\/en-us\/exchange\/clients-and-mobile-in-exchange-online\/exchange-activesync\/exchange-activesync\"><span data-contrast=\"none\">Microsoft Learn<\/span><\/a><span data-contrast=\"none\">):<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"none\">Enable or disable ActiveSync per user.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Device password and encryption policies.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Remote wipe of a lost or stolen device.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Device access rules that allow or block specific device types.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Reports on connected devices.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">One caveat matters for planning. Microsoft states that support for these features is up to the device operating system and mail app vendor, and that it has no control over which EAS features iOS and Android implement.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Where_ActiveSync_falls_short_for_company_contacts\"><\/span>Where ActiveSync falls short for company contacts<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><b><span data-contrast=\"none\">It only syncs a mailbox.<\/span><\/b><span data-contrast=\"none\"> To get company contacts onto phones, someone first has to write them into every user&#8217;s mailbox Contacts folder. That is the job of a GAL sync tool.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Behavior depends on the client.<\/span><\/b><span data-contrast=\"none\"> On Android, the mail app (Gmail, Samsung Email or another vendor&#8217;s app) implements EAS, so contact sync quality varies by vendor.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Users need a mailbox.<\/span><\/b><span data-contrast=\"none\"> Microsoft&#8217;s documentation ties ActiveSync to users who have an Exchange mailbox. Frontline workers or contractors without one have nothing to sync.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_is_CardDAV\"><\/span>What is CardDAV?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">CardDAV is an open standard for accessing, managing and sharing contacts over HTTP. The IETF published it in 2011 as <\/span><a href=\"https:\/\/www.rfc-editor.org\/info\/rfc6352\/\"><span data-contrast=\"none\">RFC 6352<\/span><\/a><span data-contrast=\"none\">, an extension of WebDAV that stores each contact in vCard format. The specification requires CardDAV servers to support secure transport using TLS, and it allows address books that several users share, such as a sales team directory.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">CardDAV handles contacts only. It does not carry email, device policies or calendars (calendars use a sister protocol, CalDAV).<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"How_CardDAV_reaches_iPhone_and_iPad\"><\/span>How CardDAV reaches iPhone and iPad<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">Apple builds CardDAV into iOS, iPadOS and macOS. In a managed deployment, IT pushes a Contacts payload (payload identifier com.apple.carddav.account) through the MDM. According to <\/span><a href=\"https:\/\/support.apple.com\/guide\/deployment\/dep00ab7903\/web\"><span data-contrast=\"none\">Apple&#8217;s payload documentation<\/span><\/a><span data-contrast=\"none\">, the payload carries:<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<ul>\n<li><span data-contrast=\"none\">The CardDAV server hostname or IP address and port.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">An optional principal URL for the account.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">The account username and, optionally, the password.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">A Use SSL setting. If the server certificate is not from a certificate authority the device trusts, Apple says to add the needed root or intermediate certificates with a Certificates payload.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Once the profile installs, the company address book appears in the native Contacts app. The user does not install or configure anything.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"How_CardDAV_reaches_Android\"><\/span>How CardDAV reaches Android<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">Android does not generally provide native CardDAV account synchronization in the same way as iOS. Standard CardDAV deployments typically require a compatible synchronization app, such as DAVx5, to make contacts available through Android&#8217;s system Contacts provider. Enterprise solutions may use different deployment methods or device management integrations. IT teams should verify the requirements of their selected CardDAV service, Android version, and MDM platform before deployment.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Where_CardDAV_falls_short\"><\/span>Where CardDAV falls short<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><b><span data-contrast=\"none\">Update frequency depends on the CardDAV implementation. <\/span><\/b><span data-contrast=\"none\">The base CardDAV standard does not define a universal push notification mechanism. Most deployments rely on scheduled refreshes or device fetch intervals, although some implementations support additional notification capabilities. For CiraSync Mobile Direct, contact freshness depends on both the configured source synchronization schedule and the device&#8217;s retrieval settings.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Microsoft 365 does not serve it.<\/span><\/b><span data-contrast=\"none\"> You need a CardDAV service that reads from your Microsoft 365 directory and publishes the result.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Contacts only.<\/span><\/b><span data-contrast=\"none\"> Email and calendars still need ActiveSync, Outlook mobile or another client.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"ActiveSync_vs_CardDAV_side-by-side_comparison\"><\/span>ActiveSync vs CardDAV: side-by-side comparison<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">The biggest difference is the source of the contacts: ActiveSync delivers each user&#8217;s own mailbox, while CardDAV delivers whatever address book a CardDAV server publishes.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<table data-tablestyle=\"MsoNormalTable\" data-tablelook=\"1696\" aria-rowcount=\"12\" aria-colcount=\"3\">\n<tbody>\n<tr aria-rowindex=\"1\">\n<td data-celllook=\"69905\"><b><span data-contrast=\"none\">Factor<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"69905\"><b><span data-contrast=\"none\">Exchange ActiveSync<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"69905\"><b><span data-contrast=\"none\">CardDAV<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"2\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Standard<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Microsoft protocol based on HTTP and XML<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Open IETF standard (RFC 6352) based on WebDAV and vCard<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"3\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Data it syncs<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Email, calendar, contacts and tasks<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Contacts only<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"4\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Where contacts come from<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">The user&#8217;s own mailbox Contacts folder<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Any CardDAV address book, including a shared company directory<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"5\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Built into Microsoft 365<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Yes, enabled by default on Exchange Online mailboxes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">No, requires a separate CardDAV service<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"6\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">iPhone and iPad<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Built in through the Exchange account<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Built in through an MDM Contacts payload<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"7\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Android<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Through a compatible EAS client<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Typically requires a compatible sync client or a supported enterprise delivery mechanism<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"8\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">How updates arrive<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Direct Push<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Device checks the server on an interval<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"9\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Global Address List<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Searchable lookup, not saved as contacts<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Saved as contacts if the CardDAV service publishes the directory<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"10\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Users without a mailbox<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Not supported<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Supported if the CardDAV service includes them<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"11\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">IT controls<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">EAS device policies, device access rules, remote wipe<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">MDM configuration profile that IT installs and removes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"12\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">2026 requirement<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Exchange Online clients must use EAS 16.1 or later<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">No Microsoft version requirement<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:27,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">In short, Exchange ActiveSync is suited to synchronizing supported mailbox data with compatible mobile devices, while CardDAV enables contact synchronization through a dedicated address book service. For company-wide contact synchronization, IT teams should evaluate whether a mailbox-based approach or a separately managed CardDAV directory best fits their existing Microsoft 365 environment, device management capabilities, and security requirements.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_changed_for_contact_sync_in_2026\"><\/span>What changed for contact sync in 2026<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">Exchange Online now enforces a minimum ActiveSync version, and that pushes some organizations to rethink which path carries their contacts.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Exchange_Online_now_requires_ActiveSync_161\"><\/span>Exchange Online now requires ActiveSync 16.1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Microsoft announced in December 2025 that devices using ActiveSync versions lower than 16.1 would lose access to Exchange Online starting March 1, 2026. In an update dated August 4, 2026, the Exchange Team said the change was fully complete in all cloud environments (<\/span><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/exchange\/exchange-online-activesync-device-support-update\/4477997\"><span data-contrast=\"none\">Microsoft Tech Community<\/span><\/a><span data-contrast=\"none\">). The rule applies only to Exchange Online, not Exchange Server, and only to mobile devices using native email apps.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">For most iPhones, nothing changed. Microsoft notes that the iOS Mail app adopted EAS 16.1 with iOS 10, and Apple lists Exchange Online with EAS 16.1 as its supported configuration (<\/span><a href=\"https:\/\/support.apple.com\/guide\/deployment\/dep158966b23\/web\"><span data-contrast=\"none\">Apple Platform Deployment<\/span><\/a><span data-contrast=\"none\">). Android is less predictable because each mail app vendor implements EAS. Microsoft said in its announcement that Gmail and Samsung Email were updating their apps to 16.1.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">Android shows why vendor dependence matters. In May 2026, users reported that the Gmail app on Android was failing to authenticate Microsoft 365 and Exchange Online accounts, and some said work contacts disappeared from native apps. Google acknowledged the issue on its Workspace Status Dashboard and rolled out a fixed app version (<\/span><a href=\"https:\/\/piunikaweb.com\/2026\/05\/21\/gmail-app-android-microsoft-365-exchange-online-authentication-issue\/\"><span data-contrast=\"none\">PiunikaWeb<\/span><\/a><span data-contrast=\"none\">).<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">To find devices still below 16.1, run a report in Exchange Online PowerShell. This version follows the approach Microsoft published:<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<pre><span data-contrast=\"none\">Get-MobileDevice -ResultSize Unlimited |<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span>\r\n\r\n<span data-contrast=\"none\">\u00a0\u00a0\u00a0 Where-Object {<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span>\r\n\r\n<span data-contrast=\"none\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ($_.ClientType -eq 'EAS' -or $_.ClientType -match 'ActiveSync') -and<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span>\r\n\r\n<span data-contrast=\"none\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 $_.ClientVersion -and<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span>\r\n\r\n<span data-contrast=\"none\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ([version]$_.ClientVersion -lt [version]'16.1')<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span>\r\n\r\n<span data-contrast=\"none\">\u00a0\u00a0\u00a0 } |<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span>\r\n\r\n<span data-contrast=\"none\">\u00a0\u00a0\u00a0 Sort-Object UserDisplayName |<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span>\r\n\r\n<span data-contrast=\"none\">\u00a0\u00a0\u00a0 Select-Object UserDisplayName, Identity, DeviceId, DeviceModel, ClientVersion |<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span>\r\n\r\n<span data-contrast=\"none\">\u00a0\u00a0\u00a0 Format-List<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335557856&quot;:16119285,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/pre>\n<p><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">This report identifies Exchange ActiveSync device records that report a client version below 16.1. A device record does not necessarily mean that the device is still actively synchronizing. Before contacting users or taking remediation action, check recent device activity with Get-EXOMobileDeviceStatistics or Get-MobileDeviceStatistics and confirm that the device has synchronized recently. Microsoft recommends Get-EXOMobileDeviceStatistics for Exchange Online. Test the final reporting workflow in your own tenant before using it for remediation.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Outlook_mobile_is_not_affected_and_it_is_a_third_contact_path\"><\/span>Outlook mobile is not affected, and it is a third contact path<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Microsoft states that Outlook for iOS and Android does not use Exchange ActiveSync to connect to Exchange Online, so the EAS 16.1 requirement does not apply to Outlook mobile.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Contact_behavior_differs_by_platform\"><\/span><span data-contrast=\"none\">Contact behavior differs by platform.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">On iOS, Outlook&#8217;s Save Contacts feature exports Outlook contacts to the native Contacts app. Microsoft recommends managing those contacts through Outlook rather than editing the exported copies in the native iOS Contacts app. Only one iOS device per account should export contacts at a time, and duplicate reconciliation can take up to 24 hours.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">On Android, Outlook&#8217;s Sync Contacts feature can provide bidirectional synchronization for supported Microsoft 365, Outlook.com and hybrid-modern-authentication accounts. Changes made to supported contact fields in the native Android Contacts app can synchronize back to Outlook.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">In both environments, administrator policy matters. Intune App Protection Policies can allow or block synchronization of managed Outlook data with native apps, and contact permissions must also be available on the device.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">Neither Outlook mobile method automatically turns the organization&#8217;s GAL into saved native contacts. It works with contacts available through the user&#8217;s Outlook account.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"ActiveSync_or_CardDAV_which_should_IT_teams_use\"><\/span>ActiveSync or CardDAV: which should IT teams use?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">Choose based on whose contacts you are delivering and whether IT manages the device, not on the protocol itself.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Choose_ActiveSync_or_Outlook_mobile_when\"><\/span>Choose ActiveSync or Outlook mobile when<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span data-contrast=\"none\">Users mainly need their own mailbox contacts alongside email and calendar.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Devices are personally owned (BYOD) and you do not want to install configuration profiles on them.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">Company contacts already reach each user&#8217;s mailbox Contacts folder through a GAL sync tool, so the mailbox carries them to the phone.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Choose_CardDAV_when\"><\/span>Choose CardDAV when<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><span data-contrast=\"none\">IT needs to distribute a centrally maintained contact directory to supported devices through a CardDAV service.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">The organization wants company contacts available in the native Contacts app for functions such as caller identification.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">The selected CardDAV solution supports the required users and devices, including scenarios where users may not have Exchange mailboxes.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<li><span data-contrast=\"none\">IT has a compatible deployment and management method, such as MDM configuration profiles for supported Apple devices or an appropriate contact synchronization client for Android.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Use_both_when\"><\/span>Use both when<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Mixed environments often need both paths: ActiveSync or Outlook mobile for each person&#8217;s mailbox, and CardDAV for the shared directory on managed devices. If you do this, deliver each set of contacts through only one path per device. Two mechanisms writing the same records is a common cause of duplicate contacts.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Quick_recommendations_by_scenario\"><\/span>Quick recommendations by scenario<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table data-tablestyle=\"MsoNormalTable\" data-tablelook=\"1696\" aria-rowcount=\"7\" aria-colcount=\"2\">\n<tbody>\n<tr aria-rowindex=\"1\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"none\">Scenario<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"none\">Approach to evaluate<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"2\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Users already have Exchange mailboxes and company contacts are centrally synced into those mailboxes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Mailbox-based synchronization through ActiveSync or Outlook mobile<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"3\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Managed iPhones need a separate IT-controlled company directory in native Contacts<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">CardDAV \/ Mobile Direct through MDM<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"4\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Managed Android devices need a separate company directory<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">CardDAV \/ Mobile Direct with the managed CardDAV Direct companion app<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"5\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Frontline users without Exchange mailboxes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">CardDAV \/ Mobile Direct<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"6\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">BYOD environment<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Evaluate mailbox-based synchronization first, then CardDAV where device-management policies support it<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"7\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Mixed fleet<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Use the appropriate delivery model per managed-device group and avoid delivering the same records through two paths<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">These are recommendations based on how each protocol works, not rules. Test with a pilot group before rolling out to the whole fleet.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Checklist_what_to_confirm_before_you_choose\"><\/span>Checklist: what to confirm before you choose<span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:280,&quot;335559739&quot;:100}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">Work through these eight checks before committing to either method.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<ol>\n<li><b><span data-contrast=\"none\">Inventory your mobile clients.<\/span><\/b><span data-contrast=\"none\"> Run the EAS version report above and confirm which users connect through native mail apps, Outlook mobile or neither.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Define who needs which contacts.<\/span><\/b><span data-contrast=\"none\"> A regional field team may need dispatchers, managers and key vendors, not the entire GAL. Smaller, targeted contact sets are easier to keep accurate.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Confirm device management coverage.<\/span><\/b><span data-contrast=\"none\"> CardDAV at scale assumes devices are enrolled in an MDM. List which devices are managed and which are not.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Identify users without mailboxes.<\/span><\/b><span data-contrast=\"none\"> If frontline or contractor accounts need company contacts, ActiveSync alone cannot reach them.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Pick one source of truth per contact set.<\/span><\/b><span data-contrast=\"none\"> Decide whether Microsoft 365, a CRM or another system is authoritative, and deliver each set through one path per device.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Review data handling.<\/span><\/b><span data-contrast=\"none\"> A hosted CardDAV service usually keeps a copy of the directory outside your tenant. Check certifications, data residency and the permission scope it requests in Microsoft Entra ID.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Agree on freshness.<\/span><\/b><span data-contrast=\"none\"> Decide how quickly a directory change must reach phones. With CardDAV, timing depends on both the service&#8217;s refresh schedule and the device&#8217;s check interval.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Pilot and validate.<\/span><\/b><span data-contrast=\"none\"> Test with a small group. Confirm contacts appear in the native app, caller ID resolves names, and the account disappears when a test device is unenrolled.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ol>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Deployment_notes_for_CardDAV\"><\/span>Deployment notes for CardDAV<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><b><span data-contrast=\"none\">iPhone and iPad:<\/span><\/b><span data-contrast=\"none\"> The Contacts payload needs the server hostname, port, username and, ideally, the principal URL and password so users are not prompted (<\/span><a href=\"https:\/\/support.apple.com\/guide\/deployment\/dep00ab7903\/web\"><span data-contrast=\"none\">Apple<\/span><\/a><span data-contrast=\"none\">).<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Your MDM:<\/span><\/b><span data-contrast=\"none\"> Apple notes that each device management vendor implements these settings differently, so follow your MDM&#8217;s own documentation. Some CardDAV services, including CiraSync, provide a ready-made profile to upload as a custom configuration profile.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Self-hosted CardDAV:<\/span><\/b><span data-contrast=\"none\"> Phones must reach the server from the internet, which typically means a public DNS name, a publicly trusted TLS certificate and port 443 open. The <\/span><a href=\"https:\/\/cirasync.com\/blog-articles\/cirasync-on-prem-carddav-support-mdm\/\"><span data-contrast=\"none\">CiraSync On-Prem CardDAV guide<\/span><\/a><span data-contrast=\"none\"> walks through these requirements for an on-premises deployment.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Android:<\/span><\/b><span data-contrast=\"none\"> Deploy the CardDAV sync app as a managed app and grant it contacts permission through policy.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Troubleshooting_common_contact_sync_problems\"><\/span>Troubleshooting common contact sync problems<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">Most contact sync problems come from one of three layers: the source data, the sync path, or the device. Identify the layer first, then change settings.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<table data-tablestyle=\"MsoNormalTable\" data-tablelook=\"1696\" aria-rowcount=\"9\" aria-colcount=\"3\">\n<tbody>\n<tr aria-rowindex=\"1\">\n<td data-celllook=\"69905\"><span data-contrast=\"none\">Symptom<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"69905\"><span data-contrast=\"none\">Likely cause<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"69905\"><span data-contrast=\"none\">What to check<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"2\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Native mail app stopped syncing on Exchange Online in 2026<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">ActiveSync client below version 16.1<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Run the EAS version report, update the OS or mail app, or move the user to Outlook mobile<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"3\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">A colleague is searchable in the GAL but shows only a number when calling<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">GAL lookup is not the same as sync<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Sync the directory into mailbox contacts, or deliver it with CardDAV<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"4\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Outlook contacts are missing from the native Contacts app<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Save Contacts is off, contacts permission is denied, or an app protection policy restricts sharing with native apps<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Turn on Save Contacts through app configuration, check the device&#8217;s contacts permission, and review your Intune app protection policy<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"5\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Duplicate contacts on iPhone<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Two mechanisms deliver the same records, or Outlook exports from two devices on one account<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Keep one path per contact set, export from one device, and allow up to 24 hours for Outlook to reconcile<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"6\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">CardDAV profile installed but no contacts appear<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Wrong hostname, principal URL or credentials, or an untrusted server certificate<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Verify the payload values and add any needed certificates with a Certificates payload<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"7\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">CardDAV changes are slow to reach phones<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">The service&#8217;s refresh schedule or the device&#8217;s check interval<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Compare the source refresh schedule with the device fetch setting<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"8\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Android contacts missing on the CardDAV path<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Sync app not installed, missing contacts permission, or background restrictions<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Confirm the managed app, its permissions and its sync status<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"9\">\n<td data-celllook=\"4369\"><span data-contrast=\"none\">The EAS version report lists devices nobody uses<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Stale device records<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"none\">Check last sync dates with Get-MobileDeviceStatistics<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559685&quot;:-108,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span data-contrast=\"none\">For Outlook-specific sync issues, see our <\/span><a href=\"https:\/\/cirasync.com\/blog-articles\/outlook-not-syncing-calendar-contacts-fix-guide\/\"><span data-contrast=\"none\">Outlook not syncing fix-it guide<\/span><\/a><span data-contrast=\"none\">.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"How_CiraSync_supports_both_delivery_paths\"><\/span>How CiraSync supports both delivery paths<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">CiraSync supports different approaches to delivering Microsoft 365 company contacts to mobile devices. Its mailbox-based synchronization places selected company contacts into targeted users&#8217; Microsoft 365 mailbox contact folders, where compatible mobile clients can synchronize them to devices. CiraSync Mobile Direct provides a separate CardDAV-based delivery option for supported managed-device environments. The appropriate method depends on the organization&#8217;s existing infrastructure, device types, security requirements and available CiraSync features.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><b><span data-contrast=\"none\">Mailbox path.<\/span><\/b><span data-contrast=\"none\"> CiraSync syncs GAL or other source contacts into each targeted user&#8217;s Microsoft 365 mailbox Contacts folder. The phone then receives them through ActiveSync or Outlook mobile contact sync. The <\/span><a href=\"https:\/\/cirasync.com\/blog-articles\/gal-sync-guide\/\"><span data-contrast=\"none\">GAL sync guide<\/span><\/a><span data-contrast=\"none\"> explains this flow.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><b><span data-contrast=\"none\">CardDAV path (Mobile Direct).<\/span><\/b><span data-contrast=\"none\"> Mobile Direct provides centrally managed CardDAV delivery of selected company contacts to native device contact apps, but deployment differs by platform. On iPhone and iPad, CardDAV is built into iOS, so IT can deploy the required CardDAV configuration through MDM without installing a separate contact-sync app. On Android, which does not provide the same native CardDAV support, CiraSync uses its CardDAV Direct companion app. IT deploys the app through device management, and the user opens it once to initialize synchronization; after that, contact synchronization runs automatically in the background.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">Before you deploy Mobile Direct, note these points from CiraSync&#8217;s own documentation:<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<ul>\n<li><b><span data-contrast=\"none\">Two freshness cycles.<\/span><\/b><span data-contrast=\"none\"> CiraSync refreshes its cache from the source on a schedule you set (daily, weekly or monthly). Each device then pulls from that cache on its own interval.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Self-healing records.<\/span><\/b><span data-contrast=\"none\"> If a user edits or deletes a synced contact on the phone, the next cycle restores the authoritative record.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">No mailbox required.<\/span><\/b><span data-contrast=\"none\"> Users without an Exchange mailbox, such as field workers and contractors, can be targeted.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/li>\n<li><b><span data-contrast=\"none\">Data location.<\/span><\/b><span data-contrast=\"none\"> The selected directory is cached in CiraSync Cloud, so contact data is processed outside your Microsoft 365 tenant. CiraSync states it is SOC 2 Type II certified and GDPR compliant, with audit logs and tenant-level data residency settings. Confirm these in your standard vendor review, and see <\/span><a href=\"https:\/\/cirasync.com\/security-at-cirasync\/\"><span data-contrast=\"none\">Security at CiraSync<\/span><\/a><span data-contrast=\"none\">.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">For more platform guides, see <\/span><a href=\"https:\/\/cirasync.com\/blog-articles\/sync-global-address-list-to-android-devices\/\"><span data-contrast=\"none\">syncing the GAL to Android devices<\/span><\/a><span data-contrast=\"none\"> and the <\/span><a href=\"https:\/\/cirasync.com\/blog-articles\/cirasync-workspace-one-ios-sync\/\"><span data-contrast=\"none\">Workspace ONE iOS contact sync guide<\/span><\/a><span data-contrast=\"none\">.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Not_sure_which_path_fits_your_fleet\"><\/span>Not sure which path fits your fleet?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"none\">Choosing between mailbox-based synchronization and CardDAV depends on your Microsoft 365 environment, device management setup and corporate contact requirements. CiraSync helps organizations keep company contacts available across supported mobile devices through its contact synchronization solutions.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/cirasync.com\/cira-platform-demo\/\"><span data-contrast=\"none\">Talk to a CiraSync specialist<\/span><\/a><span data-contrast=\"none\"> to discuss the right approach for your organization, or <\/span><a href=\"https:\/\/cirasync.com\/get-cirasync-enterprise-edition\/\"><span data-contrast=\"none\">start a free trial<\/span><\/a><span data-contrast=\"none\"> to evaluate the available capabilities.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Frequently_asked_questions\"><\/span>Frequently asked questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Is_ActiveSync_better_than_CardDAV_for_contacts\"><\/span><b><span data-contrast=\"none\">Is ActiveSync better than CardDAV for contacts?<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:240,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Neither is better in general. ActiveSync is better for syncing each user&#8217;s own mailbox, including email and calendar. CardDAV is better for pushing a shared company directory that IT controls to managed devices.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Does_Microsoft_365_support_CardDAV\"><\/span><b><span data-contrast=\"none\">Does Microsoft 365 support CardDAV?<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:240,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Not natively. Microsoft lists Exchange ActiveSync, MAPI, Outlook on the web, IMAP and POP3 as the client access methods for Exchange Online mailboxes. To deliver Microsoft 365 contacts over CardDAV, you need a separate service that reads your directory and publishes it as a CardDAV address book.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Is_Exchange_ActiveSync_being_retired_in_2026\"><\/span><b><span data-contrast=\"none\">Is Exchange ActiveSync being retired in 2026?<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:240,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">No retirement has been announced in Microsoft&#8217;s 2026 update. The change set a minimum version: since March 1, 2026, Exchange Online blocks clients below EAS 16.1, and Microsoft confirmed full enforcement in August 2026. ActiveSync is still enabled by default on Exchange Online mailboxes.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Does_Outlook_for_iOS_and_Android_use_ActiveSync\"><\/span><b><span data-contrast=\"none\">Does Outlook for iOS and Android use ActiveSync?<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:240,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">No. Microsoft states that Outlook Mobile does not use the EAS protocol to connect to Exchange Online, so the 16.1 requirement does not affect it. Outlook mobile can still save mailbox contacts to the native address book through its Save Contacts setting.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Can_ActiveSync_sync_the_Global_Address_List_to_an_iPhone\"><\/span><b><span data-contrast=\"none\">Can ActiveSync sync the Global Address List to an iPhone?<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:240,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Not as saved contacts. An iPhone can search the Exchange GAL when looking up a contact or addressing an email, but the GAL is not stored in the Contacts app. To get directory entries onto the phone, sync them into each user&#8217;s mailbox contacts or deliver them through CardDAV.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Does_Android_support_CardDAV_natively\"><\/span><b><span data-contrast=\"none\">Does Android support CardDAV natively?<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:240,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">No. Android does not include a built-in CardDAV client. A sync app is needed to bring CardDAV contacts into Android&#8217;s system contacts, and on managed devices it is deployed through the MDM.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"How_quickly_do_CardDAV_contacts_update_on_a_phone\"><\/span><b><span data-contrast=\"none\">How quickly do CardDAV contacts update on a phone?<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:240,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">It depends on two schedules. The CardDAV service refreshes from the source on its own schedule, and the device checks the CardDAV server on its fetch interval. The base CardDAV standard does not include push notifications.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Can_Microsoft_Intune_deploy_CardDAV_contacts\"><\/span><b><span data-contrast=\"none\">Can Microsoft Intune deploy CardDAV contacts?<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:240,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Yes, as long as you have a CardDAV server. On iOS, a CardDAV account is a standard Apple Contacts payload, which an MDM can deliver in a configuration profile. CiraSync, for example, provides a ready-made profile that admins upload to Intune as a custom configuration profile.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:0,&quot;335559739&quot;:160}\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>For Microsoft 365 organizations, the choice between Exchange ActiveSync and CardDAV depends on where contacts are stored, how devices are managed, and who needs access to them. Exchange ActiveSync synchronizes supported mailbox data, including personal contacts, with compatible mobile clients. CardDAV provides a way to deliver centrally managed contact directories to devices through a compatible [&hellip;]<\/p>\n","protected":false},"author":38,"featured_media":46654,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_nextfly_llmd_date_locked":false,"footnotes":"","_ppma_block_editor_authors":"","_links_to":"","_links_to_target":""},"categories":[1478,13550],"tags":[13587,28],"ppma_author":[13535],"class_list":["post-74448","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-articles","category-featured-articles","tag-carddav","tag-cirasync","rawdate-2026-10-29"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.7 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Exchange ActiveSync vs CardDAV for Microsoft 365 Contacts: Which Should Enterprise IT Teams Use in 2026?\u00a0\u00a0 &#8212; CiraSync<\/title>\n<meta name=\"description\" content=\"ActiveSync syncs mailboxes while CardDAV delivers address books. Compare both for Microsoft 365 contacts on iPhone and Android. CiraSync\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/activesync-vs-carddav-microsoft-365-contacts\/\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Exchange ActiveSync vs CardDAV for Microsoft 365 Contacts: Which Should Enterprise IT Teams Use in 2026?\u00a0\u00a0\" \/>\n<meta property=\"og:description\" content=\"ActiveSync syncs mailboxes while CardDAV delivers address books. Compare both for Microsoft 365 contacts on iPhone and Android. 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