EWS Retirement: Your Exchange Online Graph Migration Plan
EWS retirement in Exchange Online: off by default since 1 October 2026, gone on 1 April 2027. Find your callers, fix the allowlist, move to Graph.
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22 articles
Microsoft 365
Administration of the Microsoft 365 tenant and the services in it. Coverage includes Entra ID, Intune and Autopilot, Exchange Online, SharePoint, OneDrive, Teams and Teams Phone, Purview, and Copilot. Posts mix setup guides with operational topics: licensing comparisons, Groups and Teams sprawl, backup and retention limits, reporting through Graph and Entra logs, tenant-to-tenant migration, and service retirements such as EWS and SMS/voice MFA that force you to act on a deadline.
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Exchange Online Message Trace vs Mail Flow Rules: Diagnosing Delivery Failures Step by Step
Diagnose Exchange Online delivery failures: message trace in EAC and PowerShell, Get-MessageTraceV2, transport rule audits, and a repeatable runbook.
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