Most RecentReleased: May 2026 Exchange Server Hotfix UpdateChange Optics Report released into Public Preview to showcase messages impacted by future changesWriteback for Cloud-Managed Remote Mailboxes: Now in Public PreviewUpdated Exchange Online SMTP AUTH Basic Authentication Deprecation TimelineAnnouncing Period 2 Exchange 2016/2019 Extended Security Update (ESU) programNo Exchange Server Security Updates for May 2026Cloud-Managed Remote Mailboxes: Now Generally Available!Introducing Cloud-Managed Remote Mailboxes: a Step to Last Exchange Server RetirementExchange Online ActiveSync Certificate-based Authentication endpoint changesExchange 2013/2016 Monitoring Mailboxes
