Outlook stopped working today!

June Wu 0 Reputation points
2026-11-12T18:26:35.23+00:00

Our Office365 Business email stopped working all of a sudden today, we cannot access our e-mailbox through Outlook app or online. Please advise what's going on,

Outlook | Windows | Classic Outlook for Windows | For business

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  1. AI answer

    2026-11-12T18:26:55.53+00:00

    If Outlook and Outlook on the web both stopped working at the same time, this can indicate a Microsoft 365 or Exchange Online service issue rather than a problem with the Outlook app on one device.

    For a business Microsoft 365 account, the supported checks are:

    1. Check whether more than one person in the organization is affected. If multiple users have the same problem, admins should check Microsoft 365 Service health status for Exchange Online.
    2. If the issue is limited to one device or one user, run the standard Outlook fixes:
      • Start Outlook in safe mode: press Windows key + R, enter Outlook /safe, and test whether Outlook opens.
      • If safe mode works, disable COM add-ins in File > Options > Add-Ins > COM Add-ins > Go, clear active add-ins, restart Outlook, and add them back one at a time.
      • Repair Microsoft 365 from Control Panel > Uninstall a program, right-click the Microsoft 365 installation, then select Change > Online Repair.
      • Create a new Outlook profile from Control Panel > Mail > Show Profiles > Add. Warning: removing a profile can also remove associated data files. If it is unclear whether the data files are backed up or stored on a server, do not remove the existing profile.
    3. Make sure Windows and Office are fully updated.
    4. If classic Outlook is still hanging or crashing, run the classic Outlook troubleshooter or Microsoft Support and Recovery Assistant on the same Windows PC where classic Outlook is installed.

    If mailbox access is failing in both Outlook and the browser for business mail, the first priority is to have an admin verify Exchange Online service health before spending time on local Outlook repair steps.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. Jayden-P 4,385 Reputation points Independent Advisor
    2026-11-12T18:35:04.96+00:00

    Update: Microsoft just updated there is an ongoing incident at the moment. This affect multiple Microsoft 365 services.

    Microsoft 365 Service Update – MO1550821 (This link required admin role to access)

    Microsoft is continuing to investigate connectivity issues affecting multiple Microsoft 365 services. The engineering teams have identified elevated infrastructure load across several regions and are actively working to restore service capacity.

    User's image

    Hello @June Wu

    I'm sorry for the inconvenience this issue has caused.

    Multiple users have also reported similar issues accessing their Microsoft 365 mailboxes through both the Outlook desktop application and Outlook on the web.

    This may indicate a service-side issue rather than a problem with your individual account or device.

    Please be patient while Microsoft investigates and works toward resolving the issue.

    If Microsoft publishes any official updates or announcements regarding this incident, I will update you as soon as possible. In the meantime, you can also monitor the Microsoft 365 Service Health dashboard for the latest information:

    https://admin.microsoft.com/#/servicehealth

    Thank you for your understanding and patience.

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  3. Sumit 44,986 Reputation points Volunteer Moderator
    2026-11-13T02:46:55.47+00:00

    I think they have been a bit successful, more to follow.

    https://x.com/MSFT365Status/status/2121067867252613473

    We’re applying infrastructure capacity improvement where possible to help support traffic in regions coming online. We’re continuing to monitor the results of changes applied so we can identify strategic actions that can help to improve service health across all affected regions. More info under EX1550543 and MO1550821 in the Microsoft 365 admin center, as well as https://msft.it/6016xBHGu if the admin center is not available to you.

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  4. Elizna Denysschen 0 Reputation points
    2026-11-13T04:21:31.48+00:00

    Our outlook is still not working!!

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  5. Frederico Gomes 0 Reputation points
    2026-11-13T13:12:39.6433333+00:00

    Mine is still not working, and on my Android neither ...

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