How exactly does the home folder mapping in 2003 AD work?

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http://serverfault.com – I'm trying to troubleshoot an issue with a user's My Documents not being mapped to a network location as it should be. Most of the user have their AD account set to have H as their home folder and it's mapped to a network location. This works fine for everyone except a single user who's been here a long time and his My Documents keeps getting uploaded with his roaming profile to the server. He has a few hundred megs in here and although he only uses one machine this is obviously not desirable. I've searched around HKEY_CURRENT_USER and compared it with a working user but it all seems fine and (HowTos)