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Microsoft services showing Service temporarily unavailable due to high traffic

Dave 20 Reputation points
2026-05-13T07:46:05.0533333+00:00

Hi. I’m getting the message Service temporarily unavailable due to high traffic when trying to access Microsoft services (like Microsoft Outlook). It works again after some time, but keeps happening repeatedly.

What could be causing this, and is there anything I can do on my side to fix it?

Outlook | Web | Outlook on the web for business | Email
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Answer accepted by question author

RONick 85 Reputation points
2026-05-13T08:44:53.2333333+00:00

Try clearing cache, using another browser/incognito mode or disabling VPN/extensions. If it keeps happening, it’s likely on Microsoft’s side.

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  1. Demi-N 16,910 Reputation points Microsoft External Staff Moderator
    2026-05-13T09:09:13.89+00:00

    Hello @Dave,

    Thank you for your message.

    Based on the information you provided, this behavior appears to be related to the backend service issue. The “Service temporarily unavailable due to high traffic” message is typically triggered by service load or transient conditions on the Microsoft side, which can resolve on its own but may reoccur if the underlying cause persists.

    At this point, I would recommend that you contact your organization’s IT administrator and ask them to report the issue through the Microsoft 365 Admin Center. They can navigate to Service health and select Report an issue so that Microsoft can investigate this at the tenant level. This allows the support team to review service logs and check for any ongoing incidents or backend conditions affecting your environment.

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    From your side, you can also help by submitting feedback directly in Outlook on the web. To do this, go to Help > Feedback > Report a problem. This will send diagnostic information to Microsoft and may help them analyze the issue further.

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    I understand this can be inconvenient, especially when it happens repeatedly, but reporting it through these channels is the best way to ensure it is properly investigated.

    Please feel free to let me know if you need any further help.

    Kind regards,

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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  2. AI answer

    2026-05-13T07:46:23.4633333+00:00

    The message “Service temporarily unavailable due to high traffic” indicates a temporary service-side issue. The service is overloaded or its dependent back-end components are not available, so requests are rejected until capacity or connectivity recovers.

    From similar Microsoft scenarios in the context:

    • Office Online (Word/PowerPoint in a browser) can show “Service is temporarily unavailable” when front-end servers cannot reach required shared services or those services are stopped.
    • Other Microsoft cloud services can temporarily block or throttle access when there is unusual traffic or backend issues, and access is restored automatically after some time.

    In these cases, the root cause is typically on the Microsoft service side (load, backend connectivity, or protection mechanisms), not on the client device or network.

    Actions that can be tried on the client side:

    1. Wait and retry later
      • Because this is a temporary condition, access often returns without any changes on the client side.
    2. Check account status
      • For Outlook.com or consumer Microsoft accounts, verify that the account is not blocked or restricted due to unusual activity by using the Microsoft account sign-in helper or account reset pages referenced in the Outlook.com and OneDrive articles.
    3. Verify storage and account health (if using Outlook.com)
      • Ensure Microsoft cloud storage is not full, as a full mailbox/storage can cause mail delivery issues even when the service itself is reachable.
    4. Try another browser or private/incognito window
      • This helps rule out local browser cache or extension issues. If it works in private mode or another browser while still occasionally failing, that further suggests a transient service-side issue.

    If the error continues frequently over a long period (hours to days) and affects multiple devices and networks, it is likely a service-side problem that must be resolved by Microsoft. In that case, monitoring the service health dashboard (for Microsoft 365 tenants) or waiting for backend fixes is usually required; there is no reliable client-side workaround beyond the steps above.

    References:

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

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