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Outlook Mail Stopped Working
If Outlook Mail Stopped Working on your desktop or laptop, the problem is often caused by network settings, corrupted data files, or an outdated version of the app. This article gives you direct, numbered fixes that resolve the issue for most users without needing a full reinstall. Follow the steps in order to restore sending and receiving.
Why Outlook Mail Stopped Working Happens
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.
How to Fix Outlook Mail Stopped Working
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Run the built-in Outlook Repair Tool
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.
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Clear cached credentials
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.
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Recreate the email profile
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.
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Update Outlook to the latest version
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.
Additional Tips When Outlook Mail Stopped Working Persists
- Disable VPN or proxy software temporarily, as these frequently block the connection to outlook.office365.com.
- Check Windows Firewall by searching for “Allow an app through Windows Firewall” and ensure Outlook.exe has both private and public access checked.
- If you use a work or school account, ask your admin to confirm no Conditional Access policies are blocking the device.
FAQ
Does Outlook Mail Stopped Working affect the mobile app too?
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.
Can I fix Outlook Mail Stopped Working without losing emails?
Yes. All fixes above keep your mailbox data intact because messages remain stored on the Microsoft 365 server. Only local cache files are recreated.
How long does the repair process usually take?
Quick Repair finishes in under five minutes. Online Repair and profile recreation can take 15–30 minutes depending on mailbox size.
Conclusion
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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