"The messaging interface has returned an unknown error."
Posted by Jim Beveridge on 14 December 2007 07:03 AM

Symptom: You receive the error "The messaging interface has returned an unknown error. If the problem persists, restart Outlook."

Cause: The problem is usually caused by a corrupt Outlook profile.

Solution: Go into Control Panel / Mail, delete the Outlook profile entry, and recreate it. If you are using a PST file, you'll need to point the new profile at the old PST file.

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