Most RecentNewest TopicsMost LikesMost ViewedReleased: June 2026 Exchange Server Security Updates We have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. Retirement of Direct Exchange ActiveSync Certificate-Based Authentication by End of 2026 We are announcing the deprecation of Exchange ActiveSync (EAS) certificate-based authentication (CBA) directly to Exchange Online. Updated Exchange Online SMTP AUTH Basic Authentication Deprecation Timeline We wanted to provide the updated Exchange Online SMTP AUTH Basic Authentication Deprecation Timeline. Update Your Exchange SE Hybrid On-premises Rich Coexistence to Graph Configure Exchange Server SE to move your Hybrid rich coexistence scenarios to Graph API calls. 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. Replacing IIS SMTP virtual server with Exchange Edge Transport How to go about replacing IIS SMTP virtual server with Exchange Edge Transport. No Exchange Server Security Updates for April 2026 We are not releasing any Exchange Server Security Updates for April 2026. Limiting Onmicrosoft Domain Usage for Sending Emails We are announcing that all Exchange Online customers who send external email should start switching to custom (aka vanity) domain names. Released: May 2026 Exchange Server Hotfix Update We have released a Hotfix Update for Exchange Server SE. Active Directory schema extension issue if you use a Windows Server 2025 schema master role We wanted to let you know of an Active Directory replication issue you might run into if you use Windows Server 2025 schema master role.
