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Microsoft 365 Outage Disrupts Outlook, Exchange Online and Teams

SecurityWeek · By SecurityWeek News ·

The Brief · written from 9 sources

  • Microsoft Outlook, Teams, and other Microsoft 365 services went down for users worldwide on November 12, 2026.
  • Microsoft says failed server health checks and "elevated load" caused many servers to become unexpectedly unavailable.
  • Microsoft is still investigating the cause and has disclosed no evidence of a cyberattack.

Why it matters

Developers relying on Outlook, Exchange Online, Teams, Copilot, or Microsoft Cloud connections may face disrupted email, collaboration, and integration workflows while the outage lasts.

Who’s affected

  • Organizations using Microsoft 365 and Exchange Online
  • Teams using Microsoft Cloud connections and Copilot integrations
  • Users of OpenAI and Anthropic connectors to Microsoft 365 accounts

Microsoft says failed server health checks disrupted Outlook and other Microsoft 365 services. The company is still investigating the cause and has disclosed no evidence of a cyberattack. The post Microsoft 365 Outage Disrupts Outlook, Exchange Online and Teams appeared first on…

Read the full story at securityweek.com ↗

Timeline

  1. Outage reports of Outlook and Microsoft 365 access problems begin to surface worldwide

  2. Microsoft acknowledges the issue via its Microsoft 365 Status account, citing elevated load and failed server health checks

  3. Hacker News: Front Page

    Ask HN: Microsoft/Azure Outage?

  4. TechCrunch

    Microsoft’s Outlook email hit by new outage

  5. Engadget - Technology News & Expert Reviews

    Multiple Microsoft 365 services are experiencing an outage

  6. Techmeme

    Users report being unable to access Outlook, Teams, and other Microsoft 365 services; Microsoft says many of its servers became unexpectedly unavailable (Anna Washenko/Engadget)

  7. Security Latest

    Major Microsoft Outlook Outage Leaves People With Email Jobs Unable to Email

  8. BleepingComputer

    Massive Microsoft 365 outage disrupts Outlook, Teams, Copilot worldwide

  9. Security Affairs

    Microsoft Cloud Outage Hits Outlook, Teams, Copilot and AI Services

  10. Tech | The Verge

    Microsoft Outlook is down

  11. SecurityWeek

    Microsoft 365 Outage Disrupts Outlook, Exchange Online and Teams

Full coverage · 9 sources

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    Microsoft 365 Outage Disrupts Outlook, Exchange Online and Teams – The Morning Dev