Most RecentNewest TopicsMost LikesMost ViewedReleased: September 2026 V2 Exchange Server Security Updates We have released a V2 of September 2026 Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. EWS Deprecation Is Here – What This Means To You EWS deprecation in Exchange Online is starting today. Learn the details of what happens next. Impact of Exchange Online EWS Deprecation on Hybrid Rich Coexistence and Cross-org Sharing We wanted to discuss how upcoming Exchange Online EWS retirement impacts our hybrid customers and cross-org sharing scenarios. Exchange Server AD FS Modern Authentication: Expanded Outlook client support Expanded Outlook client support for Exchange Server AD FS Modern Authentication is here! Take control of your EWSAllowedAppIDs list before EWS access changes We wanted to provide additional guidance on how admins should use the EWSAllowedAppIDs allow list during EWS deprecation. Exchange 2016/2019: Throttling and Blocking up to the Final Public Update Baseline Customers still using Exchange 2016 or 2019 should read this update about oldest version of Exchange Server allowed to send email to Exchange Online over the OnPremises connector. Writeback for Cloud-Managed Remote Mailboxes: Now Generally Available Writeback for cloud-managed remote mailboxes is now Generally Available! Reminder: Exchange 2016 and 2019 ESU Program Ends in October 2026 We wanted to provide a reminder that Exchange 2016 and 2019 ESU program ends in October 2026. Writeback for Cloud-Managed Remote Mailboxes: Now in Public Preview We are happy to announce public preview of writeback for cloud-managed remote mailboxes! Addressing Exchange Server May 2026 vulnerability CVE-2026-42897 We wanted to tell you how to address the Exchange Server May 2026 vulnerability CVE-2026-42897.
