Most RecentMost ViewedMost LikesLimiting 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. Updated Exchange Online SMTP AUTH Basic Authentication Deprecation Timeline We wanted to provide the updated Exchange Online SMTP AUTH Basic Authentication Deprecation Timeline. No Exchange Server Security Updates for April 2026 We are not releasing any Exchange Server Security Updates for April 2026. 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. No Exchange Server Security Updates for March 2026 We are not releasing any Exchange Server Security Updates for March 2026. Announcing SMTP DANE & MTA STS Connector Modes in Exchange Online We wanted to announce SMTP DANE & MTA STS Connector Modes in Exchange Online. Released: February 2026 Exchange Server Security Updates We have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. Multi-Geo In-Region Routing General Availability We’re excited to share that Multi-Geo In-Region Routing reached General Availability in December 2025. Released: September 2025 Exchange Server Hotfix Updates We have released Hotfix Updates for Exchange Server Subscription Edition (SE), 2019 and 2016. Released: October 2025 Exchange Server Security Updates We have released Security Updates for Exchange Server SE, Exchange Server 2019 and Exchange Server 2016.
