User redirected folders not available offline - Windows 2008R2 Std.

Hi, I have successfully set a GPO to redirect everyone's Desktop, My Documents and My Pictures folders to a file server. The prolem is that there is no option to set that mapped network drive available for offline use when right clicking on it. The client PC's are all Win7 Pro. Any other mapped network drive can actually be set offline and synchronized without problems.

Thanks a lot in advance for your time and help.