There’s a rather arcane process to reset the offline files cache on a Windows XP system. However, the offline files caching engine was reworked in Windows Vista. After a few google searches, I located some useful blog entries that referenced a KB article and described a process involving setting a registry key and rebooting:
“add the FormatDatabase registry entry to the following registry subkey:
Then, set the FormatDatabase registry entry to 1.
The restart your computer”
I had to create the Parameters subkey. I created DWORD value and restarted the system without a network connection. Indeed, my local cache of my redirected My Documents folder was gone.