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 Cross-tenant Free/Busy, MailTips, and Calendar Sharing are moving to Cross-Tenant Access Policy Writeback for Cloud-Managed Remote Mailboxes: Now Generally Available Reminder: Exchange 2016 and 2019 ESU Program Ends in October 2026 Released: July 2026 Exchange Server Security Updates

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