Update 10/15/2025: Please see our newer post announcing General Availability of Cloud-Managed Remote Mailboxes.
Background: the “last Exchange server” challenge
Many organizations that moved all ...
Updated May 15, 2026
Version 6.0
Blog Post
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Introducing Cloud-Managed Remote Mailboxes: a Step to Last Exchange Server Retirement
I am delighted hearing that, a long awaited feature for sure!
Will that mean On-Prem will be blocked changing any attributes from various Exchange Mgmt Shell?
kumarmukeshMicrosoft
stefanwey-mct the list of attributes whose SOA would migrate to cloud is mentioned here: https://learn.microsoft.com/en-us/exchange/hybrid-deployment/enable-exchange-attributes-cloud-management#identity-exchange-attributes-and-writeback
For cloud managed mailboxes, if we change any of the SOA attributes in on-prem from any Exchange shell, they would be blocked from syncing to cloud. Identity attributes of the user will continue to sync from on-prem to cloud.