EXCHANGE IS DOWN

Cliff 0 Reputation points
2026-11-12T19:13:03.4733333+00:00

Anyone have an idea of when microsoft exchange will be back up and running

Exchange Online
Exchange Online

A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.

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  1. Aetherin 3,930 Reputation points Independent Advisor
    2026-11-12T19:17:09.1266667+00:00

    Hi @Cliff,

    There is an ongoing service disruption that may affect access to several Microsoft 365 workloads. Some users have reported or may encounter connectivity problems when using Exchange Online, Microsoft Teams, SharePoint Online, Microsoft Copilot, and Microsoft Defender XDR.

    Microsoft has logged this issue under Incident ID: MO1550821, with the current status listed as Service Degradation.

    User's image

    The investigation points to elevated infrastructure load across multiple regions as a likely factor behind the connectivity errors. Microsoft is taking several steps to address the situation, including restarting and repairing affected infrastructure components to recover capacity. In parallel, the engineering team is examining an unexpected increase in a particular type of service traffic and exploring the possibility of rerouting that traffic to alternative infrastructure to accelerate recovery.

    If you have access to the Microsoft 365 Admin Center, you can review Microsoft's service health advisory directly through this incident link. If you're an end user without admin permissions, kindly reach out to your Microsoft 365 administrator and ask them to monitor this incident and keep you informed of any relevant updates.

    I'll continue following the service health updates and share any significant changes here.

    Thank you for noticing this issue and bringing it to our attention!

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  2. Jose Benjamin Solis Nolasco 13,021 Reputation points Volunteer Moderator
    2026-11-12T19:18:21.26+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.

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  3. AI answer

    2026-11-12T19:14:09.9133333+00:00

    Microsoft is investigating an active Exchange Online incident, EX1550543, but no confirmed restoration time has been published yet.

    Check the latest update

    • Microsoft 365 administrator: Open the Microsoft 365 admin center → Health → Service health → Active issues Microsoft is working on, then select EX1550543. Its details show the status, user impact, affected services, and Microsoft’s latest progress update. Service Support and Helpdesk administrators can also view service health.^1^
    • Unable to access the admin center: Check the public Microsoft service health status.^2^
    • End user: Contact the Microsoft 365 administrator for the organization, because the admin-center entry can contain tenant-specific information unavailable publicly.

    Reports currently associate the disruption with mailbox-access failures, particularly in the Americas, but Microsoft has not provided a firm ETA.^3^

    If the admin dashboard lists the incident for the tenant, avoid changing Outlook profiles or account settings while recovery is underway. If EX1550543 is not listed for the tenant, use Service health → Report an issue so Microsoft can correlate the report with other affected organizations.^1^

    References

    1. How to check Microsoft 365 service health
    2. Microsoft service health status
    3. Microsoft Outlook outage affecting thousands of users Thursday, site reports
    AI-generated content may be incorrect. Read our transparency notes for more information.

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