Clientside caching (CSC)

Sync Center: Permission denied

AD, client PC, documents folder redirected to a file server and there to a share’s subfolder (e. g. //fileserver/usershares/%username%), CSC enabled by default (standard as of Windows Server 2K8 FWIK), multiple domain users logging in to that client. While logged in as User1, the Sync Center reports errors as Error while syncing //fileserver/usershares/User2: Permission denied.