Windows 7 is great, and overall, the Offline Files work much better than in XP, but they removed the easy ability to clear/reinitialize the Offline File cache with a simple “Ctrl+Shift + Delete Files”. It is now more a bit more involved.
I just finished migrating a customer to a new server that had people’s My Documents redirected to it, and even though on the user’s workstations, the path was updated correctly to the new server’s share, when I drilled down into the users Sync Center settings to see what was in the cache, the old server was there, unable to be deleted, essentially greyed out and orphaned. Doing the following although, somewhat of a pain, worked for me:
1) Click Start > Run
2) Enter the following and click OK:
REG ADD "HKLM\System\CurrentControlSet\Services\CSC\Parameters" /v FormatDatabase /t REG_DWORD /d 1 /f
3) Reboot the PC
4) Log in, locate the folder that should be available offline, right-click, ‘Make Available Offline’
5) Grab a beer.