{"id":69183,"date":"2026-03-24T14:55:31","date_gmt":"2026-03-24T21:55:31","guid":{"rendered":"https:\/\/cirasync.com\/?p=69183"},"modified":"2026-03-24T14:55:35","modified_gmt":"2026-03-24T21:55:35","slug":"top-10-things-every-admin-should-know-before-updating-the-gal","status":"publish","type":"post","link":"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/","title":{"rendered":"\u00a0Top 10 Things\u00a0Every Admin Should Know Before\u00a0Updating the\u00a0GAL\u00a0"},"content":{"rendered":"<p><span data-contrast=\"none\">Updating the\u00a0Global Address List is a high-impact administrative\u00a0task in Microsoft 365. In hybrid, multi-tenant, or\u00a0coexistence\u00a0environments, improper GAL Sync can cause\u00a0duplicate\u00a0objects, broken address resolution, and user confusion. This guide\u00a0outlines ten\u00a0essential technical considerations backed by Microsoft and industry-trusted sources to help admins update\u00a0the\u00a0GAL safely and\u00a0effectively.<\/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<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabla de contenidos\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#What_Is_GAL_Sync\" >What Is GAL Sync?\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#1_Identify_the_Authoritative_Directory_Source\" >1. Identify the Authoritative Directory Source\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#2_Define_Which_Objects_Should_Appear_in_the_GAL\" >2. Define Which Objects Should Appear in the GAL\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#3_Attribute_Mapping_Directly_Impacts_Outlook_and_Teams\" >3. Attribute Mapping Directly Impacts Outlook and Teams<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#4_Address_Book_Policies_Can_Limit_GAL_Visibility\" >4. Address Book Policies Can Limit GAL Visibility<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#5_Microsoft_Does_Not_Support_Native_Cross-Tenant_GAL_Sync\" >5. Microsoft Does Not Support Native Cross-Tenant GAL Sync<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#6_Sync_Frequency_Must_Respect_Microsoft_Throttling_Limits\" >6. Sync Frequency Must Respect Microsoft Throttling Limits<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#7_Naming_Conflicts_Cause_Address_Resolution_Failures\" >7. Naming Conflicts Cause Address Resolution Failures<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#8_Permissions_and_Security_Cannot_Be_Overlooked\" >8. Permissions and Security Cannot Be Overlooked<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#9_Always_Test_GAL_Sync_with_a_Pilot_Group\" >9. Always Test GAL Sync with a Pilot Group<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#10_Plan_for_Rollback_and_Recovery\" >10. Plan for Rollback and Recovery<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#Why_Automated_GAL_Sync_Matters\" >Why Automated GAL Sync Matters?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#Conclusion\" >Conclusion\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#Frequently_Asked_Questions_About_Updating_the_GAL\" >Frequently Asked Questions About Updating the\u00a0GAL<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#1_Does_Microsoft_provide_native_GAL_Sync_between_tenants\" >1. Does Microsoft provide native GAL Sync between tenants?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#2_Can_Entra_AD_Connect_sync_GALs_across_tenants\" >2. Can Entra AD Connect sync GALs across tenants?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#3_What_breaks_most_often_during_GAL_updates\" >3. What breaks most often during GAL updates?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#4_How_long_does_GAL_Sync_take_to_reflect_changes\" >4. How long does GAL Sync take to reflect changes?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#5_Does_GAL_Sync_affect_Microsoft_Teams\" >5. Does GAL Sync affect Microsoft Teams?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#6_Are_PowerShell_scripts_supported_for_long-term_GAL_Sync\" >6. Are PowerShell scripts supported for long-term GAL Sync?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#7_Should_external_users_appear_in_the_GAL\" >7. Should external users appear in the GAL?\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#8_Can_GAL_Sync_impact_mail_flow\" >8. Can GAL Sync impact mail flow?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#9_How_often_should_GAL_Sync_run\" >9. How often should GAL Sync run?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/cirasync.com\/es\/blog-articles\/top-10-things-every-admin-should-know-before-updating-the-gal\/#10_What_is_the_biggest_risk_of_manual_GAL_updates\" >10. What is the biggest risk of manual GAL updates?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 aria-level=\"2\"><span class=\"ez-toc-section\" id=\"What_Is_GAL_Sync\"><\/span><span data-contrast=\"none\">What Is GAL Sync?<\/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><b><span data-contrast=\"none\">GAL Sync<\/span><\/b><span data-contrast=\"none\">\u00a0refers to the\u00a0synchronization of directory objects such as users, mail contacts, rooms, and\u00a0resources\u00a0so they appear consistently in the\u00a0Global Address List across\u00a0Exchange\u00a0environments. This is\u00a0especially important in:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Microsoft 365 tenant-to-tenant coexistence<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Hybrid\u00a0Exchange\u00a0deployments<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Mergers and acquisitions<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Shared calendaring and collaboration scenarios<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Because\u00a0GAL Sync involves copying, transforming, and\u00a0maintaining\u00a0directory data across\u00a0environments, it must be\u00a0approached in a structured way. Updating the\u00a0GAL is not a single\u00a0action\u00a0but a sequence\u00a0of technical decisions that directly\u00a0impact\u00a0identity, mail flow, and collaboration.<\/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=\"none\">The\u00a0following steps outline\u00a0what\u00a0every admin must\u00a0validate\u00a0before\u00a0updating the\u00a0GAL to\u00a0ensure\u00a0a reliable\u00a0GAL Sync process.<\/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><span class=\"ez-toc-section\" id=\"1_Identify_the_Authoritative_Directory_Source\"><\/span><span data-contrast=\"none\">1. Identify the Authoritative Directory Source<\/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=\"none\">Before\u00a0updating the\u00a0GAL, admins must\u00a0determine\u00a0which directory is the\u00a0source\u00a0of truth.<\/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=\"none\">In Microsoft\u00a0environments, objects can originate\u00a0from:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">On-prem Active Directory\u00a0synced\u00a0via\u00a0Entra\u00a0AD Connect<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Azure\u00a0Active\u00a0Directory cloud-only objects<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">External tenants during coexistence<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Without a clear authority, attribute\u00a0conflicts and overwrites are\u00a0common during GAL Sync.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Define_Which_Objects_Should_Appear_in_the_GAL\"><\/span><span data-contrast=\"none\">2. Define Which Objects Should Appear in the GAL<\/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=\"none\">Not all directory objects belong\u00a0in\u00a0the\u00a0Global Address List.<\/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=\"none\">Admins should\u00a0explicitly scope:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"3\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Mail users<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"3\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Mail contacts<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"3\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Shared mailboxes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"3\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Room and\u00a0equipment mailboxes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Incorrect scoping leads to cluttered address books and poor user\u00a0experience.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Attribute_Mapping_Directly_Impacts_Outlook_and_Teams\"><\/span>3. Attribute Mapping Directly Impacts Outlook and Teams<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/cirasync.com\/gal-sync\/\"><span data-contrast=\"none\">GAL Sync<\/span><\/a><span data-contrast=\"none\">\u00a0depends on\u00a0accurate\u00a0attribute\u00a0mapping.<\/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=\"none\">Key attributes include:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"4\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">DisplayName<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"4\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Mail and proxy Addresses<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"4\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Title, Department, Company<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"4\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Phone\u00a0numbers and location fields<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Incorrect mappings can break address resolution,\u00a0presence\u00a0visibility, and room booking.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Address_Book_Policies_Can_Limit_GAL_Visibility\"><\/span>4. Address Book Policies Can Limit GAL Visibility<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Address Book Policies control which\u00a0address\u00a0lists users can see.<\/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=\"none\">If ABPs are\u00a0configured:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Synced objects must align with ABP filters<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Users may not see\u00a0newly synced GAL\u00a0entries<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">This often causes admins to assume\u00a0GAL Sync failed when it has not.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Microsoft_Does_Not_Support_Native_Cross-Tenant_GAL_Sync\"><\/span>5. Microsoft Does Not Support Native Cross-Tenant GAL Sync<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Microsoft 365 does not provide\u00a0built-in automation for synchronizing GALs between tenants.<\/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=\"none\">PowerShell scripts are\u00a0commonly used but are:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"6\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Unsupported for long-term automation<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"6\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Prone\u00a0to breaking during schema changes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"6\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Difficult to\u00a0monitor\u00a0and maintain<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">This limitation is\u00a0explicitly documented by Microsoft.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Sync_Frequency_Must_Respect_Microsoft_Throttling_Limits\"><\/span>6. Sync Frequency Must Respect Microsoft Throttling Limits<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Updating the\u00a0GAL too\u00a0frequently\u00a0can trigger service\u00a0throttling.<\/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=\"none\">Admins must consider:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"7\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Entra\u00a0AD\u00a0write limits<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"7\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Exchange\u00a0Online\u00a0throttling policies<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"7\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Directory propagation delays<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">A controlled GAL Sync schedule\u00a0improves reliability and performance.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Naming_Conflicts_Cause_Address_Resolution_Failures\"><\/span>7. Naming Conflicts Cause Address Resolution Failures<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Duplicate\u00a0display names or\u00a0email aliases lead to Outlook ambiguity.<\/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=\"none\">Admins should define:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"8\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Unique\u00a0naming conventions<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"8\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Alias suffix strategies for\u00a0external users<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"8\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">SMTP address conflict rules<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Without this, users may send mail to the\u00a0wrong recipient.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Permissions_and_Security_Cannot_Be_Overlooked\"><\/span>8. Permissions and Security Cannot Be Overlooked<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">GAL Sync\u00a0requires\u00a0directory access that must be\u00a0carefully scoped.<\/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=\"none\">Best practices include:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"9\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Using least-privilege\u00a0roles<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"9\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Avoiding Global Admin unless\u00a0required<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"9\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Regularly reviewing app permissions<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Improper permissions increase\u00a0security and compliance\u00a0risk.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_Always_Test_GAL_Sync_with_a_Pilot_Group\"><\/span>9. Always Test GAL Sync with a Pilot Group<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Microsoft strongly recommends validating directory changes before\u00a0full rollout.<\/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=\"none\">Testing should include:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"10\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Outlook desktop and web<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"10\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Microsoft Teams<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"10\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Mobile\u00a0clients<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">This prevents organization-wide\u00a0disruptions.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Plan_for_Rollback_and_Recovery\"><\/span>10. Plan for Rollback and Recovery<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">GAL updates are\u00a0not instantly reversible.<\/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=\"none\">Admins should document:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"11\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Object removal procedures<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"11\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Attribute\u00a0restoration steps<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"11\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Directory propagation timelines<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Without rollback planning, recovery can take\u00a0days.<\/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=\"Why_Automated_GAL_Sync_Matters\"><\/span><span data-contrast=\"none\">Why Automated GAL Sync Matters?<\/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=\"none\">Because\u00a0Microsoft does not offer native\u00a0<\/span><a href=\"https:\/\/cirasync.com\/support\/sync-gal-two-tenants\/\"><span data-contrast=\"none\">cross-tenant GAL synchronization<\/span><\/a><span data-contrast=\"none\">, admins managing coexistence\u00a0or hybrid\u00a0environments rely on automation to:<\/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 aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"12\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Reduce\u00a0manual PowerShell scripting<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"12\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Prevent attribute\u00a0conflicts<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"12\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"none\">Maintain consistent directories across tenants<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;335559738&quot;:220,&quot;335559739&quot;:220}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-contrast=\"none\">Purpose-built GAL Sync solutions address these\u00a0gaps while\u00a0aligning with\u00a0Microsoft\u00a0best practices.<\/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=\"Conclusion\"><\/span><span data-contrast=\"none\">Conclusion<\/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=\"none\">Updating the\u00a0Global Address List is no longer a simple\u00a0administrative\u00a0action. In modern Microsoft 365\u00a0environments, GAL Sync directly affects mail routing, identity consistency, Teams visibility, and overall user trust.\u00a0Errors introduced during GAL updates often surface\u00a0as widespread collaboration issues rather than isolated directory problems.<\/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=\"none\">Admins who treat GAL Sync as a structured process rather than a one-time\u00a0task are\u00a0far more\u00a0likely to avoid long-term issues. Clear directory authority,\u00a0accurate\u00a0attribute\u00a0mapping, controlled sync frequency, and pilot testing are\u00a0essential to\u00a0maintaining\u00a0a stable\u00a0and predictable\u00a0Global Address List across\u00a0environments.<\/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=\"none\">As Microsoft does not provide\u00a0native\u00a0cross-tenant GAL synchronization, organizations must rely on disciplined processes or purpose-built automation aligned with Microsoft best practices. A well-planned GAL Sync approach reduces operational risk, supports coexistence\u00a0scenarios, and\u00a0ensures\u00a0a consistent\u00a0experience\u00a0for users as\u00a0environments continue\u00a0to\u00a0evolve.<\/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=\"{}\">\u00a0<\/span><\/p>\n<h2 aria-level=\"3\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_About_Updating_the_GAL\"><\/span><span data-contrast=\"none\">Frequently Asked Questions About Updating the\u00a0GAL<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_Does_Microsoft_provide_native_GAL_Sync_between_tenants\"><\/span><strong>1. Does Microsoft provide native GAL Sync between tenants?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">No. Microsoft does not offer automated cross-tenant GAL synchronization.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Can_Entra_AD_Connect_sync_GALs_across_tenants\"><\/span><b><span data-contrast=\"none\">2. Can Entra AD Connect sync GALs across tenants?<\/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;:280,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">No.\u00a0Entra\u00a0AD\u00a0Connect supports only one tenant per sync instance.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_What_breaks_most_often_during_GAL_updates\"><\/span><b><span data-contrast=\"none\">3. What breaks most often during GAL updates?<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Attribute\u00a0mismatches and duplicate\u00a0SMTP addresses.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_How_long_does_GAL_Sync_take_to_reflect_changes\"><\/span><b><span data-contrast=\"none\">4. How long does GAL Sync take to reflect changes?<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Typically, minutes to hours, depending on service\u00a0load and throttling.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Does_GAL_Sync_affect_Microsoft_Teams\"><\/span><b><span data-contrast=\"none\">5. Does GAL Sync affect Microsoft Teams?<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Yes. Teams\u00a0uses\u00a0Entra\u00a0AD attributes for profiles and presence.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Are_PowerShell_scripts_supported_for_long-term_GAL_Sync\"><\/span><b><span data-contrast=\"none\">6. Are PowerShell scripts supported for long-term GAL Sync?<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">No. Microsoft does not support ongoing scripted GAL automation.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Should_external_users_appear_in_the_GAL\"><\/span><b><span data-contrast=\"none\">7. Should external users appear in the GAL?<\/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;:280,&quot;335559739&quot;:80}\">\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Only if\u00a0required. Microsoft recommends limiting GAL\u00a0exposure.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Can_GAL_Sync_impact_mail_flow\"><\/span><b><span data-contrast=\"none\">8. Can GAL Sync impact mail flow?<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Yes. SMTP conflicts can disrupt mail routing.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_How_often_should_GAL_Sync_run\"><\/span><b><span data-contrast=\"none\">9. How often should GAL Sync run?<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Most organizations\u00a0sync\u00a0multiple\u00a0times per day based on change\u00a0volume.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_What_is_the_biggest_risk_of_manual_GAL_updates\"><\/span><b><span data-contrast=\"none\">10. What is the biggest risk of manual GAL updates?<\/span><\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-contrast=\"none\">Human\u00a0error and lack of rollback.<\/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=\"{}\">\u00a0<\/span><\/p>\n<p><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Updating the\u00a0Global Address List is a high-impact administrative\u00a0task in Microsoft 365. In hybrid, multi-tenant, or\u00a0coexistence\u00a0environments, improper GAL Sync can cause\u00a0duplicate\u00a0objects, broken address resolution, and user confusion. This guide\u00a0outlines ten\u00a0essential technical considerations backed by Microsoft and industry-trusted sources to help admins update\u00a0the\u00a0GAL safely and\u00a0effectively.\u00a0 What Is GAL Sync?\u00a0 GAL Sync\u00a0refers to the\u00a0synchronization of directory objects such [&hellip;]<\/p>\n","protected":false},"author":44,"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":""},"categories":[1478,13550,22],"tags":[28,15,4417,13373,1414],"ppma_author":[13555],"class_list":["post-69183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-articles","category-featured-articles","category-global-address-list","tag-cirasync","tag-tag-contact-sync","tag-faq","tag-gal-sync","tag-global-address-list-gal-sync"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u00a0Top 10 Things\u00a0Every Admin Should Know Before\u00a0Updating the\u00a0GAL\u00a0 &#8212; CiraSync<\/title>\n<meta name=\"description\" content=\"Learn 10 critical things\u00a0every Microsoft 365 admin must know before\u00a0updating the\u00a0Global Address List. 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