Microsoft is disabling Exchange Web Services in Exchange Online tenant by tenant starting October 1, 2026, with a final shutdown on April 1, 2027. This video covers what organizations need to find, decide, configure, test, and clean up before those dates.
It explains how EWSEnabled and EWSAllowedAppIDs behave before and after October, and why a generated allow list reflects observed usage rather than intent. It shows how to find EWS dependencies through usage reports, permission grants, and sign-in logs, and how to move applications to Microsoft Graph with RBAC for Applications scoping.
It walks through migrating cross-tenant free/busy, MailTips, and calendar sharing from organization relationships and sharing policies to Microsoft 365 Cross-Tenant Access Policy, including the capability mapping, the coordinated cutover, rollback, and cleanup. It closes with the security review, monitoring, and a dated runbook.
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