Exchange Web Services Retirement: London SME Guide
Summary
Microsoft will retire Exchange Web Services in Exchange Online, starting default blocking in October 2026 and completing shutdown in April 2027. The change affects SMEs with custom email integrations, archiving tools, and hybrid Exchange setups, especially in regulated London industries. The article explains why Microsoft is pushing teams toward Microsoft Graph and highlights the security, platform consolidation, and developer experience benefits. It also outlines the practical migration steps, including auditing EWS usage, triaging apps, using an AppID Allow List as a stopgap, and testing in a pilot tenant. For regulated firms, the retirement creates a compliance and continuity deadline that can drive partner-led migration and audit work.
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Microsoft
$1B+