URGENT - Rename Mailbox on Exchange 2K3 (SBS Ed.)

I have a user who I recreated their NT Account for.  While I was doing so, I gave them a new account, called user2 (old account was user).  

Now whenever sending email, it displays the the "From" name as "user2".

I still have the old account (for diagnostic purposes) and I don't want to delete it - but it is renamed "userold" so that shouldn't be interferring.  How can I fix this?  I've tried "renaming" the account in ACtive Directory, but that doesn't work either (what happens to a person who changes their name - exchange locks their name in?)

Please help ASAP - this is URGENT
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Lee W, MVPTechnology and Business Process AdvisorAsked:
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David WilhoitSenior Consultant, ExchangeCommented:
I think the issue is the directory name, but a sure way to tell is simply remove the exchange attributes from user2 and from user. Then reconnect the mailbox back to the user account. Also check the SMTP address and the UPN on the user object, to see it's what it should be.

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Lee W, MVPTechnology and Business Process AdvisorAuthor Commented:
By re-renaming the bad user account, it changed the mailbox name for the bad user account.  But when I try to rename the "good" account, the mailbox name doesn't change.... maybe because the mailbox is open.
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Lee W, MVPTechnology and Business Process AdvisorAuthor Commented:
SMTP Addresses and UPN are all good.
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David WilhoitSenior Consultant, ExchangeCommented:
very possibly, or may need to wait until someone logs onto the mailbox again. Try the first solution when you get a chance...

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Lee W, MVPTechnology and Business Process AdvisorAuthor Commented:
Well, it wasn't quite what you suggested and I was in a bit of a rush.  But your comment inspired me to delete the new users mailbox and then recreate it, which solved the problem.  (Had to dump all email to a PST file though).  
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David WilhoitSenior Consultant, ExchangeCommented:
I just had another person with the same issue, we recreated the outlook profile and it worked properly. Also had another yesterday that deleted the user account, then recreated and reconnected the mailbox, and it worked too...

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