IS MICROSOFT OUTLOOK EMAIL DOWN

Michele Herbert 0 Reputation points
2026-11-12T18:31:57.34+00:00

I am unable to open Outlook. I have checked my connection and my computer, nothing else is wrong. Is microsoft outlook Down?

Outlook | Windows | Classic Outlook for Windows | For business
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  1. AI answer

    2026-11-12T18:33:53.78+00:00

    There is no Microsoft-published confirmation of a broad Outlook outage at present; the public Microsoft 365 network page reports “No current issues,” so this is more likely a Classic Outlook startup problem unless your organization’s Service Health dashboard shows an Exchange Online incident.^1^

    Check whether the service or only the app is affected

    1. Open Outlook on the web at https://outlook.office.com.
    2. Sign in with the same business account.
      • Mailbox opens: Your email service is working; continue with the Classic Outlook repair steps below.
      • Mailbox does not open: Ask your Microsoft 365 administrator to open Microsoft 365 admin center → Health → Service health and check Exchange Online for an active incident or advisory. Service-health access requires an administrator role such as Service Support admin or Helpdesk admin.^2^
    3. If no incident appears, the administrator can select Report an issue from that page.

    If Outlook on the web works

    Run Microsoft’s Classic Outlook startup troubleshooter first:

    1. Open Microsoft’s Outlook startup support page on the affected Windows PC.
    2. Select Try guided support.
    3. Allow the page to open Get Help, then follow its prompts.

    The troubleshooter requires Windows 10 or later and must run on the PC where Classic Outlook is installed.^3^

    If it cannot repair Outlook:

    1. Press Windows key + R.
    2. Enter: 
         Outlook /safe
    3. Select OK.
      • If Outlook opens, go to File → Options → Add-ins.
      • Beside Manage: COM Add-ins, select Go.
      • Record the enabled add-ins, clear their checkboxes, and restart Outlook normally. Re-enable them individually to identify the conflicting add-in. Disable them rather than using Remove.^3^

    If Safe Mode also fails, reset the navigation pane:

    1. Close Outlook.
    2. Press Windows key + R.
    3. Enter: 
         Outlook.exe /resetnavpane
    4. Select OK.

    If Outlook still does not start, use Microsoft’s same support procedure to create and test a new Outlook profile. Do not remove the old profile until any locally stored Outlook data has been backed up.^3^

    References

    1. Microsoft 365 service health status - Microsoft 365 Enterprise
    2. How to check Microsoft 365 service health
    3. I can’t start Microsoft Outlook or receive the error “Cannot start Microsoft Outlook. Cannot open the Outlook Window” | Microsoft Support
    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. Roebe Ta 1,840 Reputation points Independent Advisor
    2026-11-12T18:45:51.8066667+00:00

    Hi @Michele Herbert ,

    I would like to share an update regarding the connectivity issue affecting multiple Microsoft 365 services.

    According to Microsoft's notification (Incident ID: MO1550821), users may be unable to connect to or access multiple Microsoft 365 services, including Exchange Online, Microsoft Teams, SharePoint Online, Microsoft Copilot, and Microsoft Defender XDR.

    Microsoft has identified that the affected infrastructure is experiencing elevated load across multiple regions, which is likely contributing to the connectivity errors. Microsoft is currently restarting and repairing impacted portions of the infrastructure to restore capacity. Additionally, they are investigating an unexpected increase in a specific type of service traffic and evaluating options to redirect traffic to alternative infrastructure to expedite recovery.

    The incident is currently classified as Service Degradation, and Microsoft is actively investigating and working to mitigate the issue.

    If you have Microsoft 365 administrator privileges, please sign in to the Microsoft 365 Admin Center using this link to view the details of this issue.

    If you don't know who the admin is in your organization, you can find guidance here: How can I find my Microsoft 365 admin? - Microsoft Support    

    Alternatively, follow these steps:

    • Sign in to the Microsoft 365 Admin Center.
    • Go to Health > Service Health.
    • Search for Issue ID: MO1550821.
    • Select the issue and expand the details to review the latest updates, affected services, impact, and remediation information.

    I'll continue to monitor this case and let you know if there is any update.

    Kind regards.

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  3. Jose Benjamin Solis Nolasco 13,106 Reputation points Volunteer Moderator
    2026-11-12T18:56:36.59+00:00

    Welcome to Microsoft Q&A!

    Hello,

    What you are experiencing is currently linked to an active Microsoft 365 service incident tracked under ID EX1550543.

    Microsoft initially reported intermittent connectivity issues affecting Exchange Online mailboxes in the Americas, and has since updated the advisory to confirm that the issue may impact general Microsoft 365 service connectivity across any region.

    What this means for your environment:

    • Affected Services: Primarily Exchange Online / Outlook (desktop client, Outlook on the web, and mobile apps), along with potential authentication or connection timeouts across broader Microsoft 365 services (such as Teams, SharePoint/OneDrive, or the Microsoft 365 Admin Center) that rely on shared front-end connectivity infrastructure.

    Action Required: No configuration changes are needed on your tenant or client devices. Microsoft engineering teams are actively working on mitigation.

    How to track live status:

    Open the Microsoft 365 Admin Center using a Global Admin or Service Support Admin account.

    Navigate to Health > Service health.

    Search for incident ID EX1550543 for real-time mitigation progress and root cause updates.(You can also follow official updates via @MSFT365Status on X).

    Help make this community better for everyone: if this answer resolved your issue, please accept it or leave an upvote. If not, share more details in a comment so we can continue the discussion and find the right solution.

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