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Timeline graphic showing EWS blocked on 1 October 2026 and disabled on 1 April 2027

Web & API Development · Aug 6, 2026 · 17 min read

EWS is blocked from 1 October 2026: set the allow list before September

Microsoft starts disabling Exchange Web Services on 1 October 2026 and finishes on 1 April 2027. The decision point is earlier: the end of August 2026 allow list deadline.

Manu Shukla

#exchange-online #microsoft-graph #api-migration