Outlook 2007 prompts for password with Exchange 2010 Server

I have just one user who keeps getting a password prompt to sign into the Exchange server.  We use Outlook 2007 with a single Exchange 2010 Server.  We have two DCs and the Exchange server is one of them.  It seems that it has something to do with his user account.  

If I delete his profile and run the Outlook setup wizard it detects his username but for his email address it come up as: username@domain.local
Everyone else that runs through the Outlook wizard comes up with there email address.
I've tried different PCs to rule out his computer.  I don't see anything abnormal in his account setup.

Any suggestions?  Thanks in advance
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Check for the Logon Option in the User Account in active directory and see if user has been granted permission to logon to the mail server(s).
Had similar issue with 2007 not autopopulating the user address.  We created the proper certs on the server and added the proper DNS entries to resolve the issue but since this is only one system it shouldn't be that unless it has a HOSTS file/DNS issue.  manually adding the mailbox and using the servier IP or FQDN also helped.
Install the Feb2011 fix for outlook 2007 and it should populate the email address
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ryanthompsonAuthor Commented:
I just installed the hotfix.  It did pull in the email address rather than the username@domain.local.  I'll watch it for a few hours to make sure the password prompt stays away.  Thanks very much!
Thanks for the update and the points
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