Key Points:
- Entering Writeback for Cloud Managed Remote Mailboxes now in Public Preview
- NO remaining dependencies on their last Exchange Server
- Your deactivation Last Exchange Server
- How to use Writeback Microsoft Entra Cloud Sync Work
Let’s talk about Microsoft Unlocks Writeback Entry for Cloud-Managed Remote Mailboxes to Help Remove the Last Exchange Server. For customers who are no longer dependent on their last Exchange Server, a guide to disable your last Exchange Server. Microsoft announced Public Preview of Cloud Managed Remote Mailbox. Microsoft is excited to share these two new milestones in their journey.
List of contents
Microsoft Enables Entra Writeback for Cloud-Managed Remote Mailboxes to Help Remove the Last Exchange Server
Allows Exchange Online attribute changes (e.g., proxy addresses, custom attributes) to be synchronized back to on-premises Active Directory via Incoming Cloud Sync. This closes the gap for organizations whose line-of-business applications still rely on AD attributes, ensuring consistency even after Source of Authority (SOA) moves to the cloud.
Organizations can stop managed Exchange servers for directory synchronization only. Writeback for Cloud Managed Remote Mailboxes Simplify infrastructure, reduce patching/maintenance, and fully implement cloud-based management.
How Writeback Works
When IsExchangeCloudManaged=TrueExchange-related attributes (e.g., proxy addresses, custom attributes) are moved to the cloud, while identity attributes remain in AD. Previously, cloud-side edits did not flow back to AD, causing synchronization issues for applications that relied on AD attributes. Use of reverse writing Microsoft Entra Cloud Sync to push changes back to AD, running alongside Entra Connect Sync without interruption
Preview Details
Public Preview supports renters with <200,000 mailboxes; GA will increase this limit by end of June 2026. The documentation lists the attributes supported for writeback.
Disabling the Last Exchange Server
Historically, organizations kept at least one on-premises Exchange Server to manage mailbox attributes in Active Directory. With cloud managed remote mailbox And write back supportThis dependency was eventually eliminated.
| Important Steps in the Decommissioning Guide | Details |
|---|---|
| Prerequisite | Make sure the mailbox is managed in the cloud (IsExchangeCloudManaged=True).Confirm Microsoft Entra Cloud Sync is available for attribute rewrite. |
| Verification | Validate it mailbox attribute (proxy addresses, custom attributes, etc.) are properly synchronized between Exchange Online and AD. |
| Hybrid Cleaning | Delete hybrid connector and dependability after stable cloud sync. |
| Uninstall Process | Deactivation las an Exchange Server following Microsoft Learn’s step-by-step instructions. Including uninstalling Exchange binaries and clearing AD references. |
| Post-Uninstall Cleanup | Confirm no remaining Exchange objects still in the AD era. Ensure all management tasks are now done in the cloud. |
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Author
Anoop C Nair has been a Microsoft MVP from 2015 onwards for 10 years in a row! He is a Workplace Solutions Architect with over 22+ years of experience in the Workplace technology space. He is also a Blogger, Speaker, and Local User Group Community leader. The main focus is on Device Management technologies such as SCCM and Intune. He writes about technologies like Intune, SCCM, Windows, Cloud PC, Windows Entra, Microsoft Security, Career, etc.
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