Man... Windows Briefcase sucked but Offline files isn't much better. Anyways... the tool you want is CSCCMD, part of the Windows 2003 RK. Download This enables you to move an offline folder to a new server, delete offline folders whicht don't work anymore and much more. You can find more info on this site: http://blogs.msdn.com/jonathanh/archive/category/6957.aspx
I'm using ViceVersa (http://www.tgrmn.com/) for a lot of my clients now and this works great. You might also want to try Microsofts free SyncToy. If you know of better alternative please post in the comments!