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Thanks to IT Home reader 华南吴彦祖 for the tip!
IT Home reported on November 14 that, in a post published on November 14 Beijing time by Microsoft's official account @MSFT365Status, Microsoft announced that its services, including Outlook, had broadly recovered and were stable. However, Microsoft's public statement also said it was still restoring service for the remaining affected customers and regions.
According to Microsoft's official MO1550821 notice, this Microsoft 365 service outage began at around 13:25 Eastern Time on November 12, 2026 (IT Home note: around 2:25 a.m. Beijing time on November 13), affecting multiple Microsoft services, including Outlook, Teams, Copilot, and OneDrive.
The outage initially involved Teams, and Microsoft subsequently confirmed that Exchange Online and Outlook were also affected. It also disrupted workplace functions beyond email. Some Exchange-dependent features in services including Teams, SharePoint Online, and Microsoft 365 Copilot were affected.
Microsoft explained that the outage stemmed from an issue introduced during an earlier network capacity upgrade. The issue surfaced after a recent network change and increased the load on its infrastructure. The company said the underlying issue had been resolved, that the incident was a technical failure unrelated to a cyberattack, AI, or agents, and apologized to customers and partners for the service disruption.
During the recovery, Microsoft restored services in stages, gradually reintroducing traffic and checking system stability at each stage. The company said this process took longer but helped ensure a stable restoration of service.
As repairs progressed, mailbox access and the processing of delayed email improved. However, some users could still experience intermittent access problems or email delays during the recovery, and work to restore the remaining affected environments was continuing.