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Microsoft fixes Outlook sign-in problems on Exchange after October Windows updates

First reported Source: BleepingComputerLast editorial activity Write a comment ↓
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Microsoft has fixed Outlook sign-in and mail delivery problems that affected Exchange Server systems after the October 2026 Windows Server security updates were installed, according to a report by BleepingComputer.

What Microsoft has confirmed

Microsoft says it has resolved issues affecting Outlook sign-in and mail delivery on Exchange Server systems that had installed the October 2026 Windows Server security updates. The report by BleepingComputer is the only source supplied for this account, so the fix is reported as Microsoft's own statement rather than as independently verified.

Background on the company

Microsoft is a software and software development company based in Redmond. It was founded in 1975, and its products and services include Microsoft Windows, the operating system underlying the server environment in which the problems occurred.

Open questions

  • Which administrators were affected, and how many Exchange Server systems were involved?
  • Does the fix require any action from administrators who have already installed the updates?

Sources & evidence

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