Common triggers include a recent Windows update that breaks the connection to Microsoft 365, an expired password cached in the Windows Credential Manager, or a damaged .ost file. Before starting repairs, confirm you can access the same mailbox through Outlook on the web at outlook.office.com. If web access works, the issue is local to your desktop installation.
Open Control Panel, go to Programs and Features, select Microsoft 365 or Microsoft Office, then click Change. Choose Quick Repair first and let it finish. If the problem remains, repeat and select Online Repair instead.
Press Windows key + R, type control keymgr.dll and press Enter. Locate any entries containing “outlook” or “office”, remove them, then restart Outlook and sign in again when prompted.
Close Outlook completely. Open the Mail app from Windows search, click Show Profiles, add a new profile with a different name, set it as default, and configure your Microsoft 365 account again. Test sending and receiving before deleting the old profile.
Open any Office app, go to File > Account > Update Options > Update Now. Allow the process to complete and restart the computer once the update finishes.
No. The mobile Outlook app uses separate sync settings. If desktop fails but the phone app works, focus on the desktop profile or cached credentials.
Yes. All fixes above keep your mailbox data intact because messages remain stored on the Microsoft 365 server. Only local cache files are recreated.
Quick Repair finishes in under five minutes. Online Repair and profile recreation can take 15–30 minutes depending on mailbox size.
Applying the steps above restores normal function for the large majority of Outlook Mail Stopped Working cases. Start with the repair tool and credential clear before moving to profile recreation.
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