• Location of cache: C:\Windows\CSC\d1~d8
• Reset cache
  • In Folder Options, on the Offline Files tab, press CTRL+SHIFT, and then click Delete Files. The following message appears:
    "The Offline Files cache on the local computer will be re-initialized. Any changes that have not been synchronized with computers on the network will be lost. Any files or folders made available offline will no longer be available offline. A computer restart is required."
    Do you wish to re-initialize the cache?
  • Click Yes two times to restart the computer.
  • more notes in Microsoft web page