Most RecentNewest TopicsMost LikesMost ViewedReleased: September 2026 Exchange Server Security Updates We have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. Exchange Server AD FS Modern Authentication: Expanded Outlook client support Expanded Outlook client support for Exchange Server AD FS Modern Authentication is here! Tell us how you use ObjectGuid, SamAccountName, and DistinguishedName in Exchange Online We wanted to ask how you use Guid, SamAccountName, and DistinguishedName in Exchange Online. Help us shape Exchange Server on-premises to different online org Free/Busy after EWS retirement We wanted feedback about Exchange Server on-premises to different online org Free/Busy sharing, after EWS retirement. Change Optics Report released into Public Preview to showcase messages impacted by future changes We wanted to tell you about a new Change Optics Report that is now in Public Preview. Announcing Exchange 2016 / 2019 Extended Security Update program We are announcing an optional 6-month Extended Security Update (ESU) program for Exchange 2016 and 2019. Update on nested app authentication and deprecation of Exchange Online legacy tokens A significant update was posted related to Nested App Authentication and deprecation of Exchange Online legacy tokens. Update on Exchange Server ADFS Modern Authentication support We are pleased to provide an update regarding Exchange Server ADFS Modern Authentication support. Exchange Online Message Recall Updates We’re pleased to announce several more updates and improvements to Exchange Online message recall feature. Review an upcoming authentication change for Outlook add-ins Please review the upcoming Exchange Online authentication requirements for Outlook add-ins.
