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Introducing Cloud-Managed Remote Mailboxes: a Step to Last Exchange Server Retirement

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The_Exchange_Team
Platinum Contributor
Aug 20, 2025
Background: the “last Exchange server” challenge Many organizations that moved all mailboxes to Exchange Online keep an on-premises Exchange server solely for managing recipient attributes. In hybr...
Updated Sep 02, 2025
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Shafeeque_m
Copper Contributor
Aug 27, 2025

With the new Cloud-Managed Remote Mailboxes feature, if a mailbox has a proxyAddress conflict, can this conflict be resolved directly in Exchange Online, or is it still blocked by the original on-premises AD sync?

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kumarmukesh
Icon for Microsoft rankMicrosoft
Aug 29, 2025

Shafeeque_m​ As the proxyaddress will become cloud managed once Exchange Attribute SOA is changed to cloud. You can edit proxyaddress directly in cloud to resolve proxyaddress conflict. In fact when phase 2 would be available, the cloud value of proxy address would be written back to onpremises AD.