User unable to open attached email messages - but can open other attachments (Excel, Word, pdf, etc)

I have a Windows XP Pro user on our company network (on Windows 2003 LAN with MS Exchange Server 2003) using MS Outlook 2003 SP3.  He is a relatively new employee - started beginning of this year (2007).  Anytime someone sends him an email message and attaches another email message within it, (instead of it coming to him as a thread), he cannot open the attachment.  He sees it - the little envelope icon.  He double-clicks on it. Nothing happens.  I even try right-clicking on it and clicking "Open". Nothing. There's no error, there's no message going across the top of the email saying that Outlook blocked the attachment.  I turned off his Google toolbar and Google desktop.  I deleted his email profile and re-created.  I moved the email message to another folder - from the server to a pst file. Didn't help.  I was about to just uninstall and reinstall but I think it's overkill.  Just hoping I could find something in here.  But I didn't see anything so I'm asking a new question.
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CaoimheConnect With a Mentor Commented:
I just had the exact same issue this morning. I noticed that no '.msg' files would open even if saved to the desktop. The user had the most up to date version of Google Desktop installed, once that was removed, the files opened without any issue.
I just had the exact same problem, and removing Google Desktop fixed it!! Thank you.
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