Most RecentMost LikesMost ViewedActive 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. 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. 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. Replacing IIS SMTP virtual server with Exchange Edge Transport How to go about replacing IIS SMTP virtual server with Exchange Edge Transport. 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. Released: May 2026 Exchange Server Hotfix Update We have released a Hotfix Update for Exchange Server SE. Updated Exchange Online SMTP AUTH Basic Authentication Deprecation Timeline We wanted to provide the updated Exchange Online SMTP AUTH Basic Authentication Deprecation Timeline. Announcing Period 2 Exchange 2016/2019 Extended Security Update (ESU) program We created a Period 2 ESU for Exchange customers who need extra time to migrate to Exchange SE. Exchange Online ActiveSync Certificate-based Authentication endpoint changes We wanted to let you know about Exchange Online ActiveSync Certificate-based Authentication endpoint changes. 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.
