{"id":134000,"date":"2026-05-19T17:00:27","date_gmt":"2026-05-19T20:00:27","guid":{"rendered":"https:\/\/ubirataonline.com.br\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\/"},"modified":"2026-05-19T17:00:40","modified_gmt":"2026-05-19T20:00:40","slug":"exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory","status":"publish","type":"post","link":"https:\/\/ubirataonline.com.br\/en\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\/","title":{"rendered":"Exchange Online Adds Writeback to Sync Cloud Mailbox Changes to On-Prem Active Directory"},"content":{"rendered":"<p><br \/>\n<\/p>\n<div>\n<div data-petri-gutenberg-block=\"key-takeaways\">\n<p>Key Takeaways:<\/p>\n<ul>\n<li>Microsoft adds automatic Exchange Online writeback for hybrid environments.<\/li>\n<li>This new feature aims to reduce dependence on on-prem Exchange servers.<\/li>\n<li>The public preview is available now, with broader rollout planned later.<\/li>\n<\/ul><\/div>\n<p>Microsoft is taking a major step toward phasing out on-premises Exchange servers with the public preview of writeback for cloud-managed remote mailboxes. The new capability resolves a long-standing issue in hybrid environments by automatically synchronizing Exchange Online changes back to on-premises Active Directory.<\/p>\n<p>In Exchange Online, cloud-managed remote mailboxes are a feature that lets organizations manage Exchange-related settings for directory-synced users directly in Exchange Online instead of on\u2011premises servers, while still keeping core identity information in <a href=\"https:\/\/petri.com\/what-is-active-directory\/\" data-type=\"link\" data-id=\"https:\/\/petri.com\/what-is-active-directory\/\">Active Directory<\/a>. In this setup, administrators can control things like email addresses, mailbox visibility, and custom attributes in the cloud, which reduces the need for an on\u2011prem Exchange server and simplifies hybrid environments.<\/p>\n<p>According to Microsoft, when organizations shift management of Exchange mailbox attributes (like email aliases or visibility settings) to the cloud, those changes do not automatically update in the on\u2011premises Active Directory, which many legacy systems and business applications still rely on. This creates a mismatch between cloud and on\u2011prem data and causes inconsistencies and potential errors in applications that read from Active Directory. It forces organizations to keep an on\u2011prem Exchange server or manual processes just to keep everything aligned.<\/p>\n<h2 class=\"wp-block-heading\">How does the new writeback feature fix hybrid Exchange inconsistencies?<\/h2>\n<p>This new <a href=\"https:\/\/learn.microsoft.com\/exchange\/hybrid-deployment\/enable-exchange-attributes-cloud-management#how-to-enable-exchange-attribute-writeback\" target=\"_blank\" data-type=\"link\" data-id=\"https:\/\/learn.microsoft.com\/exchange\/hybrid-deployment\/enable-exchange-attributes-cloud-management#how-to-enable-exchange-attribute-writeback\" rel=\"noreferrer noopener\">writeback mechanism<\/a> automatically synchronizes changes made in Exchange Online back to the on\u2011premises Active Directory. Instead of cloud updates staying isolated, tools like Microsoft Entra Cloud Sync ensure that key Exchange attributes (such as email addresses and custom fields) are continuously updated in both environments. This eliminates mismatches and keeps legacy systems that rely on AD functioning correctly without requiring manual updates or an on\u2011prem Exchange server.<\/p>\n<p>\u201cWriteback uses Microsoft Entra Cloud Sync as the transport from Exchange Online back to on-premises AD. If you already use Microsoft Entra Connect Sync, you do not need to uninstall or replace it. Cloud Sync runs alongside Connect Sync \u2013 Connect Sync continues to handle your directory synchronization exactly as before, and Cloud Sync only handles the Exchange attribute writeback. There is no impact on your existing mailboxes, users, or sync configuration,\u201d the Exchange team <a href=\"https:\/\/techcommunity.microsoft.com\/blog\/Exchange\/writeback-for-cloud-managed-remote-mailboxes-now-in-public-preview\/4520138\" target=\"_blank\" data-type=\"link\" data-id=\"https:\/\/techcommunity.microsoft.com\/blog\/Exchange\/writeback-for-cloud-managed-remote-mailboxes-now-in-public-preview\/4520138\" rel=\"noreferrer noopener\">explained<\/a>.<\/p>\n<h2 class=\"wp-block-heading\">What are the public preview limitations?<\/h2>\n<p>Microsoft mentioned that this new feature allows organizations to keep their on\u2011premises applications working smoothly by ensuring they still have access to necessary Active Directory data. It also helps to reduce reliance on on\u2011prem Exchange servers and support a gradual transition toward fully cloud-based Exchange management.<\/p>\n<p>Microsoft notes that writeback for Cloud\u2011Managed Remote Mailboxes currently supports organizations with up to 200,000 cloud\u2011managed mailboxes and is available in public preview for commercial customers. The company also plans to raise this limit when the feature reaches general availability in June 2026.<\/p>\n<\/p><\/div>\n<p><br \/>\n<br \/><a href=\"https:\/\/petri.com\/exchange-online-writeback-cloud-mailbox-active-directory\/\">Source link <\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Key Takeaways: Microsoft adds automatic Exchange Online writeback for hybrid environments. This new feature aims to reduce dependence on on-prem Exchange servers. The public preview is available now, with broader rollout planned later. Microsoft is taking a major step toward phasing out on-premises Exchange servers with the public preview of writeback for cloud-managed remote mailboxes. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":134001,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"googlesitekit_rrm_CAow2JLhCw:productID":"","_gspb_post_css":"","maa_idioma":"","maa_pais":"","footnotes":""},"categories":[1],"tags":[9055,10756,4312,36862,18278,36860,3334,36861,36859,36858],"class_list":["post-134000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ubirata","tag-active","tag-adds","tag-cloud","tag-directory","tag-exchange","tag-mailbox","tag-online","tag-onprem","tag-sync","tag-writeback"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Exchange Online Adds Writeback to Sync Cloud Mailbox Changes to On-Prem Active Directory - Ubirat\u00e3 Online Not\u00edcias - A realidade ao seu alcance!<\/title>\n<meta name=\"description\" content=\"Key Takeaways: Microsoft adds automatic Exchange Online writeback for hybrid environments. This new feature aims to reduce dependence on on-prem Exchange\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ubirataonline.com.br\/en\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Exchange Online Adds Writeback to Sync Cloud Mailbox Changes to On-Prem Active Directory\" \/>\n<meta property=\"og:description\" content=\"Key Takeaways: Microsoft adds automatic Exchange Online writeback for hybrid environments. This new feature aims to reduce dependence on on-prem Exchange\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ubirataonline.com.br\/en\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\/\" \/>\n<meta property=\"og:site_name\" content=\"Ubirat\u00e3 Online Not\u00edcias - A realidade ao seu alcance!\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/portalubirataonline\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/portalubirataonline\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-19T20:00:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-19T20:00:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/ubirataonline.com.br\/wp-content\/uploads\/2026\/05\/Exchange-Online-Adds-Writeback-to-Sync-Cloud-Mailbox-Changes-to.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"REDA\u00c7\u00c3O: UBIRAT\u00c3 ONLINE - F\u00c1BIO AUGUSTO CELESTINO\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@x.com\/ubirataonline\" \/>\n<meta name=\"twitter:site\" content=\"@ubirataonline\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"REDA\u00c7\u00c3O: UBIRAT\u00c3 ONLINE - F\u00c1BIO AUGUSTO CELESTINO\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"NewsArticle\",\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\\\/\"},\"author\":{\"name\":\"REDA\u00c7\u00c3O: UBIRAT\u00c3 ONLINE - F\u00c1BIO AUGUSTO CELESTINO\",\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/#\\\/schema\\\/person\\\/372f87bbd3fdd79b8556b84c98d0bc1c\"},\"headline\":\"Exchange Online Adds Writeback to Sync Cloud Mailbox Changes to On-Prem Active Directory\",\"datePublished\":\"2026-05-19T20:00:27+00:00\",\"dateModified\":\"2026-05-19T20:00:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\\\/\"},\"wordCount\":497,\"publisher\":{\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/ubirataonline.com.br\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/Exchange-Online-Adds-Writeback-to-Sync-Cloud-Mailbox-Changes-to.jpg\",\"keywords\":[\"Active\",\"Adds\",\"Cloud\",\"Directory\",\"Exchange\",\"Mailbox\",\"online\",\"OnPrem\",\"Sync\",\"Writeback\"],\"articleSection\":[\"Ubirat\u00e3\"],\"inLanguage\":\"en-US\",\"copyrightYear\":\"2026\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/en\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\\\/\",\"url\":\"https:\\\/\\\/ubirataonline.com.br\\\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\\\/\",\"name\":\"Exchange Online Adds Writeback to Sync Cloud Mailbox Changes to On-Prem Active Directory - Ubirat\u00e3 Online Not\u00edcias - A realidade ao seu alcance!\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/ubirataonline.com.br\\\/exchange-online-adds-writeback-to-sync-cloud-mailbox-changes-to-on-prem-active-directory\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/ubirataonline.com.br\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/Exchange-Online-Adds-Writeback-to-Sync-Cloud-Mailbox-Changes-to.jpg\",\"datePublished\":\"2026-05-19T20:00:27+00:00\",\"dateModified\":\"2026-05-19T20:00:40+00:00\",\"description\":\"Key Takeaways: Microsoft adds automatic Exchange Online writeback for hybrid environments. 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