u/ScottSchnoll

Writeback for Cloud-Managed Remote Mailboxes is now in Public Preview

Microsoft announced today that writeback for Cloud-Managed Remote Mailboxes is now in Public Preview!

https://techcommunity.microsoft.com/blog/Exchange/writeback-for-cloud-managed-remote-mailboxes-now-in-public-preview/4520138

For customers with no remaining dependency on their last Exchange Server, an updated guide for decommissioning it is now available at https://learn.microsoft.com/exchange/hybrid-deployment/decommission-last-exchange-server.

reddit.com
u/ScottSchnoll — 7 days ago

Microsoft released the May 2026 HU, which contains functionality that allows you to start switching your Exchange Server hybrid rich coexistence from using EWS to REST-based Graph API calls.

To move your Exchange Hybrid rich coexistence from EWS to Graph:

  1. Install the May 2026 HU.
  2. Follow the documentation to enable the Graph API hybrid workflow.
u/ScottSchnoll — 15 days ago