We wanted to tell you that we will be retiring OWA Light in Exchange Server.

We wanted to share details about the EWSAllowedAppIDs, to help you manage retirement of EWS applications in Exchange Online.

We have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only.

Here are some tips on how to learn more about Exchange Online resource mailbox use.

How to go about replacing IIS SMTP virtual server with Exchange Edge Transport.

We are happy to announce public preview of writeback for cloud-managed remote mailboxes!

We wanted to tell you how to address the Exchange Server May 2026 vulnerability CVE-2026-42897.

We are not releasing any Exchange Server Security Updates for May 2026.

We are announcing the deprecation of Exchange ActiveSync (EAS) certificate-based authentication (CBA) directly to Exchange Online.

Announcing General Availability of Mailbox Import and Export Microsoft Graph APIs.