EWS in Exchange online is about to be retired

In 2018, Microsoft announced the discontinuation of feature updates to Exchange Web Services (EWS) in Exchange Online, urging developers to transition to Microsoft Graph. Now, Microsoft has announced that starting October 1, 2026, EWS requests from non-Microsoft applications to Exchange Online will be blocked.

This is a significant change that emphasizes the need for IT departments to take action. It's crucial to start mapping existing tools, scripts, or integrations that rely on EWS and plan for their transition.

There's no direct way to opt out of this change. The change only applies to Microsoft 365 and Exchange Online. EWS in Exchange Server will not be affected.