Microsoft begins disabling Exchange Web Services (EWS) in Exchange Online today, ahead of the API's permanent retirement on April 1, 2027. Introduced with Exchange Server 2007, EWS allows applications to access mailbox data including email, calendars, and contacts. Microsoft says the service "no longer aligns with today's security, scale, or reliability requirements" and recommends moving integrations to Microsoft Graph, although some capability gaps remain. Beginning October 1, Microsoft will start changing tenant-level EwsEnabled settings left at $null to $false, blocking EWS. Administrators needing temporary continuity can explicitly set the value to $true and add approved applications…
1 Oct 2026 · The Register
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