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Unknown Error on Outlook (0x80040201)

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asked by (120 points) about Microsoft Office Outlook
edited by

When Sending and Receiving I get an error message Sending' reported error (0x80040201): 'Unknown Error 0x80040201'.

My system is Vista and using Microsoft Office 2007. How do I repair this error?

1 Answer

0 votes
answered by (329k points)
edited by

This happens when you disconnect the Outlook account from the Exchange server and then reconfigure it, but this time with the local PST file instead of the one from server. The Global Address list items will stay cached in the Outlook client and cause this error.

To find the problem, use a file manager or Windows Explorer and navigate to the following path: C:\users\username\appdata\roaming\microsoft\outlook

Delete the .nk2 files and restart Outlook.

Note: The .nk2 files are hidden system files that you might not find. To show the files in Windows Explorer, go to Tools > Folder Options > select the View tab and select "Show hidden files and folders". Also uncheck "Hide extensions for known file types" and "Hide protected operating system files".

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