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Exchange Online outage causes email delays, 'Server busy' errors

September 4, 2026 · BleepingComputer · Severity: MEDIUM

Microsoft is working to resolve an ongoing Exchange Online outage that is delaying email sent to and received from external domains.

Key Takeaways

  • An Exchange Online outage is causing email delays and 'Server busy' errors for Microsoft 365 users.
  • The disruption affects business communications across organizations relying on Microsoft's cloud email service.
  • Microsoft is investigating the issue and working to restore normal email delivery functionality.
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