Fixing the Unknown 0x80040605 Error in Outlook on Windows 11

In this article, we will discuss solutions to resolve the 0x80040605 Unknown error in Outlook on Windows 11. This error usually occurs when users try to access their account settings under the Data files tab in Outlook. The issue may arise due to corrupted Outlook profiles or data files. Here are some fixes to resolve the problem:

1. Repair Outlook Data files: If the cause of the issue is corrupted Outlook Data files, repairing them may help.

2. Create a new Outlook profile: If the Outlook profile is corrupted, deleting it and creating a new profile may resolve the problem. Follow the instructions in the Mail Setup window to add your account to the new profile.

3. Export the Registry key: Some users encounter the Unknown error 0x80040605 while exporting the Outlook .PST file. In such cases, exporting the Profiles key from the Registry Editor and merging it with the Registry on another computer may help. Before merging the exported Registry key, create a System Restore Point and back up your Registry.

4. Repair Office: If none of the above solutions work, repair Microsoft Office by running an online repair.

If you encounter the Unknown error 0x80040600 in Outlook, repair the corrupted Outlook Data files. When you see the error code 0x80040115, which displays the “We can’t complete this because we can’t contact the server right now” message, check for bad internet connection, conflicting add-ins, or a corrupt Office installation.

If you cannot select multiple attachments in Outlook, refer to our next article for a solution.