I have Windows 2003 Server. In the AD User Profile, it's set to map a drive letter (H:) to a home folder: Connect H: To: \\server\Users\[user folder].
If I open a CMD prompt and type "net use H: \\server\Users[user folder], the drive mapping works properly. I also have a logon script defined, with additional drive mappings defined, and those work properly. The problem is isolated to the mapping of a drive letter to a home folder, as defined on the Server 2003 user Profile.
This seems to be Windows 7 issue since XP Pro workstations work fine.