Most RecentMost ViewedMost LikesAuto-Archiving for Exchange Online We are happy to announce the time-based archiving feature for Exchange Online users with archives. 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. High Volume Email: Continued support for Basic Authentication & other important updates This announcement provides several important updates for High Volume Email. Updates to High Volume Email (HVE) Public Preview We are excited to share some updates to High Volume Email (HVE) Public Preview. No Exchange Server Security Updates for January 2026 We are not releasing any Exchange Server Security Updates for January 2026. Exchange Online to retire Basic auth for Client Submission (SMTP AUTH) Today, we are announcing that Exchange Online will permanently remove support for Basic authentication with Client Submission (SMTP AUTH) starting March 2026. 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). Announcing Exchange 2016 / 2019 Extended Security Update program We are announcing an optional 6-month Extended Security Update (ESU) program for Exchange 2016 and 2019. Announcing General Availability (GA) of the New Message Trace in Exchange Online We are excited to announce the GA of the new Message Trace in the Exchange admin center (EAC) in Exchange Online. Exchange Online canceling the Mailbox External Recipient Rate Limit The Mailbox External Recipient Rate Limit in Exchange Online is being canceled.
