Try Help, Detect and Repair as the first step.
--
Diane Poremsky [MVP - Outlook]
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"Jess" <(E-Mail Removed)> wrote in message
news:A0C8BB22-A3D5-40EC-8D02-(E-Mail Removed)...
> I', using Outlook 2003 and just added Outlook Connector. Now I get a
> "Messaging Interface has returned an unknown error" message.
> How to I fix it? I've already closed and restarted Outlook and my
> computer.