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Microsoft: October Windows Server updates break Exchange sign-in, mail flow
Microsoft confirmed that October Windows Server security updates are causing sign-in failures and mail delivery problems on some Exchange Server systems. The issue affects organizations running affected versions of Exchange Server alongside the latest Windows Server patches. Microsoft is investigating the root cause and working on a resolution.
Why it matters: Exchange administrators managing hybrid or on-premises deployments need to assess patch compatibility before applying October updates to avoid service disruption to email users.
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- First seen by Cybersecurity Tracker