We have released a V2 of September 2026 Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only.

EWS deprecation in Exchange Online is starting today. Learn the details of what happens next.

We wanted to let you know that you should update your Exchange Online PowerShell module over the next several months.

We wanted to discuss how upcoming Exchange Online EWS retirement impacts our hybrid customers and cross-org sharing scenarios.

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

Expanded Outlook client support for Exchange Server AD FS Modern Authentication is here!

We wanted to provide additional guidance on how admins should use the EWSAllowedAppIDs allow list during EWS deprecation.

Customers still using Exchange 2016 or 2019 should read this update about oldest version of Exchange Server allowed to send email to Exchange Online over the OnPremises connector.

We wanted to ask how you use Guid, SamAccountName, and DistinguishedName in Exchange Online.

We wanted feedback about Exchange Server on-premises to different online org Free/Busy sharing, after EWS retirement.