When I open Outlook I receive the message: 'The operation failed. The messaging interface have returned an unknown error. If the problem persists

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Ruhul Laskar

Try the steps provided in the following links:

Note: the links given below apply to Outlook 2003 and Outlook 2007; however you may try the same steps for Outlook 2010 beta



Spam emails are supposed to be delivered in the Spam folder in Outlook.
Ruhul Laskar, Microsoft Support

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M. Hilts

I got this error only after changing from Office 2007 to Office 2010 and I believe I found a simple solution to the problem.

When you add an email address into Outlook, it automatically adds the display name and the email address appears in parenthesis: John Doe (JohnDoe@whatever.com). All I did was change the parenthesis to carets <JohnDoe@whatever.com> and the problem went away.
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