Released: September 2026 Exchange Server Security Updates Exchange Server AD FS Modern Authentication: Expanded Outlook client support Take control of your EWSAllowedAppIDs list before EWS access changes Exchange 2016/2019: Throttling and Blocking up to the Final Public Update Baseline Tell us how you use ObjectGuid, SamAccountName, and DistinguishedName in Exchange Online Help us shape Exchange Server on-premises to different online org Free/Busy after EWS retirement Notes from the field: testing EWSAllowedAppIDs safely Understanding the new 100 GB mailbox entitlement for Microsoft 365 Business suites Where is Exchange SE CU1 anyway? Released: August 2026 Exchange Server Security Updates

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