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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Microsoft 365
23 articles
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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