Most RecentNewest TopicsMost LikesMost ViewedExchange servers may become unstable after installation of October 2026 Windows updates More information related to issues that some Exchange servers might experience after installation of October 2026 Windows updates. Cross-tenant Free/Busy, MailTips, and Calendar Sharing are moving to Cross-Tenant Access Policy We wanted to provide information related to migration of existing Exchange Online Organization Relationships to the new sharing model. Released: October 2026 Exchange Server Security Updates We have released October 2026 Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. Cloud-based Message Recall in Exchange Online Today we’re thrilled to announce that the new Exchange Online Message Recall feature has arrived! Sending From Email Aliases – General Availability We are announcing General Availability (GA) of Sending from Email Alias in Exchange Online. Change Optics Report released into Public Preview to showcase messages impacted by future changes We wanted to tell you about a new Change Optics Report that is now in Public Preview. The Change Optics Report is now Generally Available in Exchange Online We are announcing General Availability of the Change Optics Report in Exchange Online. Released: September 2026 Exchange Server Security Updates We have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. Trust DigiCert Global Root G2 Certificate Authority to Avoid Exchange Online Email Disruption We wanted to let you know of an upcoming change in certificates trusted by Exchange Online. Introducing Exchange Online Tenant Outbound Email Limits We’re introducing new tenant-level outbound email limits (also known as the Tenant External Recipient Rate Limit or TERRL).
