I had never had this happen before, but we could not change the location of a redirected My Documents folder after setting up a client with a new server. I’m not sure we ever figured out the whys of it, any ideas? However we did figure out a work around.
For users who existed before the server was replaced, the Group Policy to redirect their My Documents folders wasn’t applying the new location. Also you couldn’t change the Target Location in the My Document’s properties menu (it was grayed out). For newly created uses the Group Policy worked just fine.
The only way to change the target of My Documents was in the local Registry. There were two places to look:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
As you can see from the picture my entries are just the default entries. On the machines we worked on they were pointing to the network shares on the old server. Sometimes the entry would be in User Shell Folders only, Shell Folders only, or both.
Just change the Key you need with the location you want and that should do it (ex. \\server1\users\jdoe).
For more information also see: http://support.microsoft.com/?id=221837