Exchange 2003 sending mail to users not originally listed in To: line

I am having a wierd problem with some of my Exchange users.  When user A address a message to user B exchange seems to insert an additional address (user C) into the To: line.  I can see the message getting delivered to user B & user C.  I have run the Outlook with the /cleanrules switch but that didn't seem to help.  User B & user C are completly random and in both instances they don't work in the same departments.
mcgnAsked:
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tgtranConnect With a Mentor Commented:
Have you looked in the local profile of user A and rename/delete the NK2 file?  Outlook uses that file to autocomplete email addresses
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mcgnAuthor Commented:
Thanks - I then found NK2view.exe so that we could manually eliminate individual entries.
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