MC1227454 | Exchange Web Services (EWS) retirement update

Service

Exchange Online

Last Updated

2026-02-05T16:58:33.83Z

Published

2026-02-05T16:57:52Z

Message ID

MC1227454

[Introduction] We're updating the timeline and process for the retirement of Exchange Web Services (EWS) in Exchange Online. As previously announced, EWS will be retired in favor of Microsoft Graph, which offers improved security, modern authentication, and broader capability support. A phased disablement begins October 1, 2026, with permanent shutdown starting April 1, 2027. [When this will happen:] • Phased EWS disablement begins: October 1, 2026 • Full and permanent EWS retirement: April 1, 2027 • EWS App AllowList feature availability: Coming soon (before retirement milestones) [How this affects your organization:] Who is affected: • Organizations using custom or vendor applications that...

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