Hybrid Exchange admins, the wait is finally over. You no longer need to hold on to your Last Exchange Server just to manage mailbox attributes.
Microsoft has introduced a new capability in Exchange Online that shifts the Source of Authority (SOA) for Exchange-specific attributes directly to the cloud.
Exchange attributes like proxyAddresses, HiddenFromAddressListsEnabled, and CustomAttributes can now be updated using EXO PowerShell, Microsoft 365 Admin Center, or the Exchange Admin Center.
Identity attributes still remain managed in on-prem AD.
This update finally removes the dependency on your on-prem Exchange Server for routine mailbox attribute management.
📌 Rollout details:
Phase 1 (Preview): Per-mailbox opt-in via IsExchangeCloudManaged = true.
Phase 2 (coming): Cloud changes sync back to on-prem AD through Entra Cloud Sync.
A huge step forward for hybrid organizations aiming to simplify operations and retire their Last Exchange Server.
Read more: https://lnkd.in/eYeKr2hn