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Microsoft retirements and changes: December 2026

2 retirements, end-of-support dates and changes across Defender, Exchange Online.

Defender

December 2026 Application Guard for Office removed from Microsoft 365 Apps Defender

Exchange Online

End of Dec 2026 SMTP AUTH basic authentication off by default Exchange Online

← November 2026 January 2027 → All of 2026 Add every deadline to your calendar

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