# Microsoft fixes Exchange sign-ins broken by Windows Server updates

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1 outlet covering · First listed: BleepingComputer, Nov 11, 2026, 3:07 AM · Read it: <https://www.bleepingcomputer.com/news/microsoft/microsoft-fixes-exchange-sign-ins-broken-by-october-windows-server-updates/>

Microsoft has fixed Outlook sign-in and mail delivery issues on Exchange Server systems after installing the October 2026 Windows Server security updates.

## Who's covering it

In the order they published:

- Nov 11, 2026, 3:07 AM: [Microsoft fixes Exchange sign-ins broken by Windows Server updates](<https://www.bleepingcomputer.com/news/microsoft/microsoft-fixes-exchange-sign-ins-broken-by-october-windows-server-updates/>) — BleepingComputer (Specialist, United States)
  Microsoft has fixed Outlook sign-in and mail delivery issues on Exchange Server systems after installing the October 2026 Windows Server security updates.