Microsoft Warns Windows Server Updates May Disrupt Exchange Email — Here's the Workaround - TechRepublic
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Microsoft’s October security updates have created an unexpected problem for some Exchange Server administrators: email services that stop working properly.
Windows Server updates released October 13, 2026, can disrupt mailbox access, delay outgoing messages and interfere with database replication in on-premises Exchange environments. Microsoft confirmed the problem and published a temporary registry workaround on October 16 while investigating the issue.
The failures complicate an already demanding patch cycle. October’s Patch Tuesday release included fixes for 1,413 vulnerabilities, according to CrowdStrike’s analysis, leaving administrators balancing security protections against potential email disruptions.
October Windows Server updates trigger Exchange failures
In an October 16 advisory, Microsoft’s Exchange Team identified four potentially affected updates:
- Windows Server 2025: KB5126646
- Windows Server...
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