I keep getting the above named error message when I am doing many different things (not one in particular) in Outlook 2007. Also, getting an error messsage that a data file did not close properly every time I open Outlook. Any help would be appreciated.
Outlook 2007 "Messaging Interface has returned an unknown error"(4 posts)
Have you run Office Diagnostics from the Help tab?
You may need your disk to repair if issues are found.
Regardless, if you see a small gear icon in the lower right, do not close Outlook until that disappears.
Trying to repair with Scanpst.exe may help.
You didn't say which OS you use but try searching for that file, you definitely have it.
You must close Outlook before running it, but please wait until there is no gear icon as stated above.
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