Exchange Web Services (EWS) fully disabled in Exchange Online

Exchange OnlineMicrosoft 365

Who is affected

Every remaining EWS client of Exchange Online. On-premises Exchange is not part of this retirement.

What to do

1. Confirm the EWS usage report shows no remaining production callers.
2. Check the parity-gap roadmap on the EWS deprecation page for features your apps still need.

Source

“Phased disablement begins October 1, 2026, with permanent retirement on April 1, 2027.”

EWS deprecation timeline“April 2027: EWS is fully disabled.”

Checked 9 Nov 2026 Link to this deadline