Outlook 2007 requesting password

I am running outlook 2007 Standard edition on a Windows 7 Ultimate machine. I have already added the machine to my domain and setup the users email account. The problem I am having is, every time I open the users outlook it wants a username and password to connect to server.domain.com. When I go to another machine on the domain running Outlook 2003 professional, I do not get this message. Any Ideas?
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I have encountered this problem in the past when user name wasn't correct under the exchange server setting.  Have you gone to email accounts under tools and verified the user name on the account? If not that would be a your first place to double check.
D_HarderAuthor Commented:
I took a look here and everything seems to be correct.
D_HarderAuthor Commented:
The solution was a manuel update for Exchnage Server 2007 found on Microsofts webisite. Update Rollup 9 for Exchange Server 2007 Service 1 KB 983917. After you download this update you will need to open a dos command, point to the file and run it.

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