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Outage · High impact12 sources

The health check that took down Outlook: inside the Microsoft 365 outage of November 12

DEV · By Kashif Manzer ·

The Brief · written from 12 sources

  • Microsoft 365 and Outlook went down on Thursday, 2026-11-12, and sources report the disruption was still ongoing about 12 hours later.
  • Users could not access email and chat, and the outage also took much of Microsoft's cloud services offline, according to TechCrunch.
  • Microsoft says it is gradually restoring service, though some apps and features were still degraded per The Verge, and reported fixes kept failing according to The Register.

Why it matters

Teams that depend on Outlook, Exchange Online or Microsoft 365 for email, chat and trading or operational workflows lost access for many hours, and sources describe workers falling back to phones and fax machines.

Who’s affected

  • Organizations relying on Microsoft 365
  • Teams using Exchange Online
  • Outlook users

On Thursday lunchtime, Outlook stopped opening. Not for one company, and not in one country. People clicked their inbox and got nothing. They refreshed. They restarted the app. They tried their phone. Nothing worked, and the usual fixes did nothing at all, because the problem was…

Read the full story at dev.to ↗

Timeline

  1. Outage begins; Outlook stops opening for users in multiple countries, around Thursday lunchtime

  2. Microsoft is still working to restore access; says it is gradually restoring service

  3. Hacker News: Front Page

    Microsoft Outlook/365 still down after 12 hours

  4. Hacker News: Front Page

    Global Microsoft Outage

  5. www.theregister.com - Articles

    Microsoft's massive M365 outage stretches past 12 hours as its fixes keep failing

  6. www.theregister.com - Articles

    Microsoft's massive M365 outage stretches past 15 hours as its fixes keep failing

  7. www.theregister.com - Articles

    Microsoft's massive M365 outage stretches past 20 hours as its fixes keep failing

  8. Bloomberg Technology

    Microsoft Outage Gums Up Markets, Forces Traders to Use Phones

  9. Bloomberg Technology

    Microsoft Struggles to Restore Access to Software

  10. Tech | The Verge

    Microsoft’s massive Outlook outage continues

  11. Latest from Tom's Hardware

    Japanese workers return to fax machines during ongoing Microsoft 365 outage

  12. TechCrunch

    Microsoft’s latest email outage turned into a full blown global cloud crisis

  13. SecurityWeek

    Microsoft Struggles to Restore Email and Other Services in a Global Outage

  14. DEV Community: backend

    The health check that took down Outlook: inside the Microsoft 365 outage of November 12

Full coverage · 12 sources

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    The health check that took down Outlook: inside the Microsoft 365 outage of November 12 – The Morning Dev