Double and triple emails with Outlook 2007 and Exchange 2003

I have a user that when they send internal emails to a few of the other users, the recipients get duplicate and triplicate emails.  The users are on the same domain, using outlook 2007 clients and exchange 2003.  Any help would be greatly appreciated.
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B HCommented:
open the exchange system manager on the server and at the bottom, tools, tracking, search for emails from that user and see if there's anything odd

what i'm thinking is:

joe sends an email to bob, bill, mary

bob has a rule that says "when joe sends me an email, redirect a copy to bill" - that way bill gets it "from" joe because its "redirect"
B HCommented:
^ bill gets it from joe, and a 2nd one "from joe" due to bob's redirect
I've seen this happen in a couple situations.
One was a forgotten email rule that never worked. It became active after I made changes on the server. Check rules on all parties involved
Another situation was a cache mode issue. User was working offline and online in a manner that caused caching to resend email in some instances.

Have you taken any steps to recreate the user's profile or isolate the problem to the sender?
Is the user sending to individual recipients or are distribution groups involved?
Do duplicates/triplicates only affect specific recipients?

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