Microsoft Outlook Email Service Issue

jaikumar 0 Reputation points
2026-11-13T05:34:32+00:00

Hi Microsoft team Currently we unbale to access the mail kindly advise when the resolve the issue now any development

awaiting your valuable reply

thanks

jaikumar

Outlook | Windows | Classic Outlook for Windows | For business
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  1. Liora 3,690 Reputation points Independent Advisor
    2026-11-13T05:58:40.6233333+00:00

    Dear @jaikumar,

    I hope you’re having a good day.

    According to Microsoft's official notification (Incident ID: MO1550821), users are currently unable to access their mailboxes using Outlook desktop (MAPI), Outlook on the web, or Exchange ActiveSync due to an issue affecting Exchange Online and several other Microsoft 365 services.

    Latest Status & Resolution Progress (Updated Nov 13, 2026, at 12:43 GMT+7 / 05:43 UTC):

    Root Cause & Mitigation: Microsoft engineers identified that a core connection process on the backend servers became overwhelmed. They are currently taking a measured approach to identify, repair, and stabilize the affected infrastructure while balancing traffic to restore capacity safely.

    Security Confirmation: Microsoft has confirmed that there is no indication of any malicious activity causing this incident.

    Next Official Update: Microsoft is treating this incident with top priority and will publish the next status update by 14:00 GMT+7 (07:00 UTC) today, November 13, 2026. While an exact final resolution time (ETA) has not yet been confirmed, recovery efforts are actively underway.

    Screenshot 2026-11-13 at 12.58.13

    How to track real-time updates:

    If you have Microsoft 365 administrator privileges, please sign in to the Microsoft 365 Admin Center to view the latest technical updates:

    • 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.

    If you are a regular user, please reach out to your organization's IT administrator so they can monitor the progress for you. 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

    I'll continue to monitor this case and let you know here as soon as there is any update from Microsoft.

    Warm regards,  

    If the answer is helpful, please select "Yes, accept answer". If you have any questions or new updates, please feel free to comment below. 

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  2. jaikumar 0 Reputation points
    2026-11-13T05:42:26.3366667+00:00

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    Team enclosed error screen shot

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  3. AI answer

    2026-11-13T05:35:22.9+00:00

    Microsoft is currently reporting a Microsoft 365 service degradation affecting Outlook and Exchange Online mail access; monitor the incident in Service health because the latest update and restoration estimate will be posted there.^1^

    Check your organization’s status

    If you are a Microsoft 365 administrator:

    1. Sign in to the Microsoft 365 admin center.
    2. Go to Health → Service health.
    3. Under Active issues Microsoft is working on, open the Outlook or Exchange Online incident.
    4. Review User impact, Status, Last updated, and All updates for Microsoft’s current progress and any estimated restoration time.
    5. Select Manage notifications for this issue if you want status updates by email.^2^

    If the admin center is inaccessible, continue checking the public Microsoft service-status page linked above.

    What to do now

    • There is no confirmed resolution time in the available public information. The incident details in your tenant’s Service health dashboard are the authoritative source for restoration updates.
    • Avoid deleting Outlook profiles, removing accounts, reinstalling Office, or changing registry settings while a matching Exchange Online incident remains active. Those actions do not resolve a service-side outage.
    • If Outlook on the web is available, it can be used temporarily. If both Outlook desktop and the web mailbox fail, wait for the service incident to be restored.
    • If you are not an administrator, contact your organization’s IT team and ask them to check Health → Service health.

    If no matching incident appears

    An administrator should select Report an issue on the Service health page. For delivery-specific failures, run Diag: Troubleshoot Email Delivery in the Microsoft 365 admin center. If only one mailbox is affected, compare Outlook desktop with Outlook on the web; receiving mail on the web but not in Classic Outlook indicates a client or profile issue rather than organization-wide mail flow.^3^

    When reporting the problem, include:

    • The approximate start time and time zone
    • Number of affected users
    • Whether Outlook on the web also fails
    • The exact error message and code
    • Whether sending, receiving, sign-in, or all mailbox access is affected

    References

    1. Microsoft service health status
    2. How to check Microsoft 365 service health
    3. Find and fix email delivery issues as a Microsoft 365 for business admin
    AI-generated content may be incorrect. Read our transparency notes for more information.

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