Hi,
Could you please let me know the following questions:
Is it the only user who have this issue?
How your Outlook connects to Exchange, Pop3, imap4 , mapi(Exchange mode) or Rpc over Http?
If you create a new user in AD and setup an account for this new user in the laptop, can it connect to Exchange?
Do you have an ISA 2000 or ISA 2004 installed? If so, check the following KB:
http://support.microsoft.com/kb/897716
Please try to move the user’s mailbox to another mailbox store in Exchange. You also can try export the mailbox data to a pst and then delete this user in AD and create a new one, then import the data to the new mailbox.
How to export/import mailbox data
http://technet.microsoft.com/en-us/library/bb266964.aspx
http://technet.microsoft.com/en-us/library/bb691363.aspx
Thanks,
Elvis