TechBleepingComputer41 minutes ago
Microsoft Fixes Exchange Sign-In Issues
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Microsoft fixed Outlook sign-in and mail delivery issues on Exchange Server systems via the November 2026 Patch Tuesday updates KB5131080 and KB5131090. The outage stemmed from October 2026 Windows Server updates limiting Endpoint Mapper memory. Affected users on Windows Server 2019 and later must install the new patches or run a specific registry command to restore access.
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