Exchange 2007 - Corrupt mailbox???

This morning I configured a users Outlook 2003, it was pointed at one Exchange 2003 server (an old vendor) and I pointed to my Exchange 2007 server. Now I cannot Import the mail that I exported from the old mail server.

I opened up Outlook, exported his mail to a PST file, and then I closed Outlook opened up the Mail settings in Control Panel. I proceeded to change the Outlook settings from the old mail server to the new mail server. Once that was completed, I opened up Outlook so I could import the items that I exported but Outlook keeps crashing.

I have tried this on 3 different PC's and Outlook crashes on his account only. I can get partial imports of his old mail but Outlook will not stay open long enough to get it all. And it even crashes if I don't do anything - even if I just open his mailbox in Outlook and just let it sit it will crash after a minute or 2.

Other things I have tried:
-      Deleted his AD account and Exchange Mailbox: I removed and re-added both his Ad account and his Exchange Mailbox but it did not change anything.
-      Restart the Information Store service

Oh, you also may want to know that I have not seen any error messages other than "Outlook has encountered a problem and needs to close".
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o_b_cConnect With a Mentor Author Commented:
I have given up.
I just started him a brand new box and he will have all of his new email in it and all of his old emails in a PST.
Christopher MartinezCommented:
So this account has a pst/ost attached to it? If so try to repair the file using scanpst/scanost located in the Microsoft 12 folder under program files. Scan the file and fix the errors, let it recreate the files and then attach them to the profile. Or have you tried to start up outlook in safe mode to see if it works?
outlook.exe /safe
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Are you trying to move the mailbox from 2003 to 2007 server by exporting it to pst and then just repointing outlook to the 2007 server? If so, it won't work!

You need to move the mailbox from the 2003 to 2007 server using the EMC.

o_b_cAuthor Commented:
1) Starting in Safe Mode did not work - Same issue
2) OST was for his old profile and should not affect his new profile, even still if it did it should not affect other PC's from opening the mailbox. (this is my assumption)
3) Rajith - I am not doing that. I am exporting the mail from my vendor's 2003 mail server to a PST file, pointing Outlook to a new account that I created on my 2007 server, then importing the PST into it. I did this same process with the other 150 mailboxes a few weeks ago, but now this last user is back from vacation and I am doing his account and I am having these problems.
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
As you are using Exchange 2007, give the last user a mailbox (blank) in your 2007 server. Take the pst to a pc/server where you have your exchange tools and outlook installed and run the following command from the shell

import-mailbox -identity username -pstfolderpath c:\username.pst

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