{"id":73557,"date":"2026-09-09T12:33:30","date_gmt":"2026-09-09T19:33:30","guid":{"rendered":"https:\/\/cirasync.com\/?p=73557"},"modified":"2026-09-09T13:26:46","modified_gmt":"2026-09-09T20:26:46","slug":"build-vs-buy-microsoft-365-contact-sync","status":"publish","type":"post","link":"https:\/\/cirasync.com\/fr\/blog-articles\/build-vs-buy-microsoft-365-contact-sync\/","title":{"rendered":"Build vs. Buy: You Can Build This. The Question Is Whether You Want to Own\u00a0It.\u00a0"},"content":{"rendered":"<p><span data-contrast=\"auto\">Every IT team has had this conversation. Someone needs contacts and calendars\u00a0synced\u00a0across Microsoft 365, and someone else says, \u00ab\u00a0we can just script that.\u00a0\u00bb The call usually gets made in an afternoon, by whoever&rsquo;s free that week, and it doesn&rsquo;t get tested until much later: when the person who wrote the script leaves, when Microsoft changes an API underneath it, or when a VIP&rsquo;s contacts break at the worst possible time.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Building a contact and calendar sync tool is absolutely possible.\u00a0We&rsquo;re\u00a0not here to tell you it\u00a0isn&rsquo;t. The real question\u00a0isn&rsquo;t\u00a0whether your team can build it.\u00a0It&rsquo;s\u00a0what\u00a0you&rsquo;re\u00a0committing to own\u00a0once\u00a0it&rsquo;s\u00a0live.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"TLDR\"><\/span><span data-contrast=\"none\">TL;DR<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><b><span data-contrast=\"auto\">Build cost is only the starting point.<\/span><\/b><span data-contrast=\"auto\">\u00a0No license fee, but real engineering time goes into field mapping, merge logic, error handling, and testing before anything ships.<\/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=\"auto\">Maintenance is where scripts\u00a0get\u00a0expensive.<\/span><\/b><span data-contrast=\"auto\">\u00a0Monitoring runs, catching duplicates, and updating code as Microsoft&rsquo;s APIs change (like the\u00a0<\/span><a href=\"https:\/\/techcommunity.microsoft.com\/blog\/exchange\/exchange-online-ews-your-time-is-almost-up\/4492361\"><span data-contrast=\"none\">EWS retirement happening now<\/span><\/a><span data-contrast=\"auto\">) can run 130 to\u00a0260 hours\u00a0a year on support tickets alone.<\/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=\"auto\">Customizability cuts both ways.<\/span><\/b><span data-contrast=\"auto\">\u00a0Every new ask, like a CRM connector or group-based targeting, means more custom code and more long-term maintenance debt.<\/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=\"auto\">Reliability tends to\u00a0break\u00a0at scale.<\/span><\/b><span data-contrast=\"auto\">\u00a0Scripts commonly run one mailbox at a time, and an interrupted job often restarts from the top instead of resuming.<\/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=\"auto\">Security and compliance become your team&rsquo;s job.<\/span><\/b><span data-contrast=\"auto\">\u00a0Home-grown scripts often need broad mailbox permissions, and your team owns designing,\u00a0maintaining, and auditing that access.<\/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=\"auto\">Microsoft&rsquo;s platform keeps moving.<\/span><\/b><span data-contrast=\"auto\">\u00a0Basic Authentication is gone. Exchange Web Services starts retiring in stages on October 1, 2026. Betting on \u00ab\u00a0someday\u00a0\u00bb carries real timeline risk.<\/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<\/ul>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_Build_vs_Buy_Comes_Down_To\"><\/span><span data-contrast=\"none\">What Build vs. Buy Comes Down To<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">We&rsquo;ve\u00a0applied this framework across IT teams that tried building their own sync tools, and it consistently comes down to five factors.\u00a0Each one is really about ownership: what you&rsquo;re signing up to maintain once it&rsquo;s live.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<table data-tablestyle=\"MsoNormalTable\" data-tablelook=\"1696\" aria-rowcount=\"6\" aria-colcount=\"3\">\n<tbody>\n<tr aria-rowindex=\"1\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Factor<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">If You Build It<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">If You Buy\u00a0<\/span><\/b><a href=\"https:\/\/cirasync.com\/\"><b><span data-contrast=\"none\">CiraSync<\/span><\/b><\/a><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559738&quot;:0,&quot;335559739&quot;:0}\">\u00a0<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"2\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Build Cost<\/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\"><span data-contrast=\"auto\">No license fee, but real engineering time before anything ships. Your team maps fields, builds merge logic, handles errors, and tests everything before it goes live.<\/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=\"auto\">Configure your sources, your audience (including Entra ID groups through Collections), and how contacts get delivered, including options that need no mailbox at all. Most\u00a0environments are\u00a0live in days.<\/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\"><b><span data-contrast=\"auto\">Maintenance Cost<\/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\"><span data-contrast=\"auto\">Ongoing engineering work: monitoring runs, catching duplicates, and updating the script as Microsoft&rsquo;s APIs change, like the EWS retirement happening now. Ten tickets a week at 15 to 30 minutes each runs 130 to\u00a0260 hours\u00a0a year,\u00a0roughly three\u00a0to six work weeks, before counting anything else.<\/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=\"auto\">Syncs run on a schedule you set, including near-real-time delivery options, and recover automatically after interruptions. Checking a user&rsquo;s status is a quick dashboard lookup. Tracking Microsoft&rsquo;s platform changes is our job.<\/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\"><b><span data-contrast=\"auto\">Customizability<\/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\"><span data-contrast=\"auto\">Fully yours on paper, but each new ask (a second source, a CRM connector, field-level control, group-based targeting, cross-tenant sync) means more custom code. Flexibility and long-term maintainability pull against each other as the script grows.<\/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=\"auto\">All configuration: multiple sources with merge priority, field-level control, Collections for group-based targeting, CRM connectors, and cross-tenant sync are already built.<\/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\"><b><span data-contrast=\"auto\">Reliability<\/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\"><span data-contrast=\"auto\">Scripts commonly run one mailbox at a time, in a fixed order. An interrupted job often restarts from the top. Failures can be silent, and sometimes the first person to notice is an executive with the wrong number at the worst moment.<\/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=\"auto\">Mailboxes\u00a0sync\u00a0in parallel rather than one at a time. Interrupted runs resume without starting over, so nobody waits at the back of the line.<\/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\"><b><span data-contrast=\"auto\">Security &amp; Compliance<\/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\"><span data-contrast=\"auto\">A home-grown script can be built securely, but your team now owns designing,\u00a0maintaining, and auditing its access, including the broad mailbox permissions most scripts need to run.<\/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=\"auto\">Access is scoped and\u00a0consent-based. Auditing and access controls are already built into the product, so your team\u00a0isn&rsquo;t\u00a0designing or\u00a0maintaining\u00a0them from scratch.<\/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-contrast=\"auto\">To be fair, a script works fine for a handful of static contacts with no compliance need, until scale, change, or oversight shows up.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Same_Logic_Higher_Stakes_When_Sync_Runs_Both_Ways\"><\/span><span data-contrast=\"none\">Same Logic, Higher Stakes When Sync Runs Both Ways<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">The tradeoffs above get bigger when contacts or records need to move in both directions, like keeping a CRM and Microsoft 365 mailboxes\u00a0in sync\u00a0with each other. A one-way script becomes two processes\u00a0watching for\u00a0conflicts, so a duplicate or overwrite error now runs both ways instead of one. We apply the same dashboard visibility, role-based access, and automated conflict handling to two-way sync, so the math above\u00a0doesn&rsquo;t\u00a0reset just because data needs to travel both ways.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_IT_Leadership_Should_Ask\"><\/span><span data-contrast=\"none\">What IT Leadership Should Ask<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><b><span data-contrast=\"auto\">Who owns this in two years?<\/span><\/b><span data-contrast=\"auto\">\u00a0A product is documented, tested, and supported\u00a0independent\u00a0of any one person on your team. A script often\u00a0isn&rsquo;t.<\/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=\"auto\">What&rsquo;s\u00a0the fully loaded cost of ownership?<\/span><\/b><span data-contrast=\"auto\">\u00a0Count engineering time, the risk of that person leaving, and the support burden that grows as more requirements get added.<\/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=\"auto\">Will Microsoft eventually solve\u00a0this natively?<\/span><\/b><span data-contrast=\"auto\">\u00a0Its roadmap is moving toward tighter APIs, with no sign of native mobile directory\u00a0sync\u00a0on it. Exchange Web Services starts retiring in stages in October 2026. Betting on \u00ab\u00a0someday\u00a0\u00bb carries real timeline risk.<\/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<\/ul>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"Microsofts_Platform_Keeps_Moving_Underneath_Home-Grown_Tools\"><\/span><span data-contrast=\"none\">Microsoft&rsquo;s Platform Keeps Moving Underneath Home-Grown Tools<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">This\u00a0isn&rsquo;t\u00a0the first time a platform change has broken home-grown integrations, and it\u00a0won&rsquo;t\u00a0be the last:<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<ul>\n<li><b><span data-contrast=\"auto\">Starting October 2022<\/span><\/b><span data-contrast=\"auto\">, Microsoft began permanently disabling Basic Authentication across Exchange Online tenants. Any script still using a username and password lost access as its tenant was migrated, with no way to turn it back on once the change took effect.<\/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=\"auto\">Exchange Web Services (EWS) is being retired in stages<\/span><\/b><span data-contrast=\"auto\">: blocked by default starting October 1, 2026, with a permanent, no-exceptions shutdown on April 1, 2027. A short configuration window exists to delay enforcement, but\u00a0it&rsquo;s\u00a0a temporary bridge.<\/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=\"auto\">Even scripts already rebuilt on Microsoft Graph\u00a0aren&rsquo;t\u00a0exempt.<\/span><\/b><span data-contrast=\"auto\">\u00a0Graph enforces rate limits per app and tenant that Microsoft has\u00a0stated\u00a0it will not increase on request. Detecting that and retrying correctly is engineering work your team owns, just on newer plumbing.<\/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<\/ul>\n<p><span data-contrast=\"auto\">Whatever your script\u00a0runs on\u00a0today,\u00a0it&rsquo;s\u00a0built on an interface Microsoft can change without asking. We watch for these\u00a0changes\u00a0so your sync keeps working when they happen.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"A_Few_Questions_Worth_Asking_Whatever_You_Choose\"><\/span><span data-contrast=\"none\">A Few Questions Worth Asking, Whatever You Choose<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><span data-contrast=\"auto\">Can IT verify\u00a0what&rsquo;s\u00a0in a user&rsquo;s\u00a0contacts\u00a0without opening their mailbox?<\/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=\"auto\">Who can add users, change the sync, or view results, and how is that controlled?<\/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=\"auto\">How fast can a new\u00a0hire&rsquo;s\u00a0contacts\u00a0actually appear\u00a0on their phone?<\/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<\/ul>\n<p><span data-contrast=\"auto\">Ask\u00a0these of your current approach, a script\u00a0you&rsquo;re\u00a0considering, or\u00a0<\/span><a href=\"https:\/\/cirasync.com\/\"><span data-contrast=\"none\">CiraSync<\/span><\/a><span data-contrast=\"auto\">.\u00a0Your answer\u00a0<\/span><i><span data-contrast=\"auto\">is<\/span><\/i><span data-contrast=\"auto\">\u00a0your decision.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:0,&quot;335559737&quot;:0,&quot;335559738&quot;:240,&quot;335559739&quot;:240,&quot;335559740&quot;:279}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"See_This_Framework_Applied_to_Your_Environment\"><\/span><span data-contrast=\"none\">See This Framework Applied to Your Environment<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-contrast=\"auto\">Have\u00a0a script or an architecture in mind?\u00a0<\/span><a href=\"https:\/\/calendly.com\/ciraapps-sales\/talk-to-sales\"><span data-contrast=\"none\">Show\u00a0us.<\/span><\/a><span data-contrast=\"auto\">\u00a0We&rsquo;ll\u00a0apply this framework to your environment and help you\u00a0determine\u00a0where building makes sense and where buying does.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span><span data-contrast=\"none\">FAQ<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Is_it_actually_possible_to_build_my_own_Microsoft_365_contact_and_calendar_sync_tool\"><\/span><span data-contrast=\"none\">Is it actually possible to build my own Microsoft 365 contact and calendar sync tool?\u00a0<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Yes.\u00a0Building it is absolutely possible, and many IT teams have done it.\u00a0The tradeoff\u00a0isn&rsquo;t\u00a0feasibility,\u00a0it&rsquo;s\u00a0ownership. Your team takes on field mapping, merge logic, error handling, and testing before anything ships, plus ongoing maintenance after\u00a0it&rsquo;s\u00a0live.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"How_much_does_maintaining_a_home-grown_sync_script_actually_cost\"><\/span><span data-contrast=\"none\">How much does\u00a0maintaining\u00a0a home-grown sync script\u00a0actually cost?\u00a0<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">As an illustrative example, ten support tickets a week at 15 to 30 minutes each runs 130 to\u00a0260 hours\u00a0a year,\u00a0roughly three\u00a0to six work weeks, before counting monitoring, duplicate cleanup, or updates for Microsoft API changes.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Whats_happening_with_Exchange_Web_Services_EWS_and_why_does_it_matter_for_home-grown_scripts\"><\/span><span data-contrast=\"none\">What&rsquo;s\u00a0happening with Exchange Web Services (EWS), and why does it matter for home-grown scripts?<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">\u00a0EWS is being retired in stages. Microsoft will block it by default starting October 1, 2026, with a permanent shutdown on April 1, 2027. Scripts built on EWS will lose access unless\u00a0they&rsquo;re\u00a0migrated before then.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"What_happens_if_the_person_who_built_our_sync_script_leaves_the_company\"><\/span><span data-contrast=\"none\">What happens if the person who built our sync script leaves the company?\u00a0<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">This is one of the biggest risks of a home-grown build. A script&rsquo;s documentation and institutional knowledge often live with the person who wrote it. When they leave, troubleshooting and updates become harder, and sometimes nobody fully understands the script anymore.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<h3 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"How_is_buying_CiraSync_different_from_building_a_script_for_two-way_CRM_and_Microsoft_365_sync\"><\/span><span data-contrast=\"none\">How is buying\u00a0CiraSync\u00a0different from building a script for two-way CRM and Microsoft 365 sync?\u00a0<\/span><span data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;335559738&quot;:160,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"auto\">Two-way sync doubles the risk of a home-grown\u00a0build, since\u00a0conflicts and overwrite errors can now happen in both directions.\u00a0CiraSync\u00a0applies dashboard visibility, role-based access, and automated conflict handling to two-way sync, so your team\u00a0isn&rsquo;t\u00a0building and\u00a0maintaining\u00a0two custom processes that\u00a0have to\u00a0watch each other.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:240,&quot;335559739&quot;:240}\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Every IT team has had this conversation. Someone needs contacts and calendars\u00a0synced\u00a0across Microsoft 365, and someone else says, \u00ab\u00a0we can just script that.\u00a0\u00bb The call usually gets made in an afternoon, by whoever&rsquo;s free that week, and it doesn&rsquo;t get tested until much later: when the person who wrote the script leaves, when Microsoft changes [&hellip;]<\/p>\n","protected":false},"author":44,"featured_media":73559,"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":"","_links_to":"","_links_to_target":""},"categories":[1478,13550],"tags":[28,15,13422],"ppma_author":[13555],"class_list":["post-73557","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-articles","category-featured-articles","tag-cirasync","tag-tag-contact-sync","tag-microsoft-365","rawdate-2026-09-09"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Build vs. Buy: You Can Build This. 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Joe proceeded to grow his marketing skillset in the casino industry, supporting email and SMS lifecycle marketing, collaborating across teams to enhance online visibility and refine guest communication. He now serves as a Marketing Specialist at Cirasync, where he focuses on digital campaigns, leveraging strengths in digital strategy, CRM, and SEO.\u00a0 He is passionate about data\u2011driven insights, cross\u2011functional teamwork, and helping organizations build meaningful, lasting connections with their audiences.\",\"url\":\"https:\\\/\\\/cirasync.com\\\/fr\\\/author\\\/jorcirasync-com\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Build vs. Buy: You Can Build This. The Question Is Whether You Want to Own\u00a0It.\u00a0 &#8212; CiraSync","description":"Home-grown Microsoft 365 sync scripts carry hidden maintenance costs and EWS retirement risk. See what build vs. buy really costs. 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