Keeps disconnecting from the exchange mailbox

Lewis C 0 Reputation points
2026-11-11T14:02:03.42+00:00

I'm running into an annoying problem with Classic Outlook on my work PC. I'm using Windows 11 Pro with a Microsoft 365 Business Standard license. Outlook randomly switches to "Disconnected" or "Trying to connect..." even though my internet connection remains stable. What's strange is that Outlook on the web continues to work without any issues during these interruptions. I've already restarted the application, recreated my Outlook profile, and checked for available Office updates, but the problem keeps coming back. I also noticed that the connection status occasionally changes to "Need Password" before Outlook reconnects on its own.

Outlook | Windows | Classic Outlook for Windows | For business
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  1. Ana Le 2,965 Reputation points Independent Advisor
    2026-11-11T14:31:03.9033333+00:00

    Hi,

    I understand how frustrating these interruptions are, especially after you’ve already recreated your Outlook profile and checked for updates.

    The occasional “Need Password” status makes authentication worth investigating, but it does not confirm the cause. Outlook on the web continuing to work shows that the mailbox remains accessible through your browser; it does not rule out a connection or sign-in issue affecting classic Outlook.

    Please try the following:

    1. On the affected PC, open Get Help, search for Outlook password problem, and follow the authentication checks. If the disconnections continue, run the Classic Outlook connectivity troubleshooter, which addresses intermittent connectivity issues. On the following Microsoft page, select Start under that specific troubleshooter: Classic Outlook troubleshooters: Classic Outlook troubleshooters | Microsoft Support
    2. Close Outlook, press Windows + R, enter outlook.exe /safe, and press Enter. Use Outlook long enough to check whether the disconnection recurs. Safe mode disables COM add-ins and some customizations, so remaining connected during this test would help narrow down the issue, though it would not confirm the cause by itself. If Outlook stays connected in safe mode, work with your IT team to test the COM add-ins through File > Options > Add-ins > Manage: COM Add-ins > Go, restarting Outlook after each change.

    If the problem persists, note the time and time zone of an interruption and ask your Microsoft 365 administrator to review the corresponding Microsoft Entra sign-in events for any error code or failure reason. This can help determine whether a sign-in failure coincides with the disconnection.

    Microsoft’s guidance for administrators -Troubleshoot sign-in errors: How to troubleshoot Microsoft Entra sign-in errors | Microsoft Learn

    Could you also share the following to help narrow this down?

    • Your Outlook version and build from File > Office Account > About Outlook.
    • Whether “Need Password” opens a sign-in window or only appears in the status bar.
    • Whether colleagues experience the same issue, and any findings from the troubleshooters.

    You can continue using Outlook on the web while this is being investigated.

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  2. Lewis C 0 Reputation points
    2026-11-11T14:03:07.6566667+00:00

    can someone please advise me on how to fix this?

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