Vista Off-line file difficulties

Hi,
I store all my files on the file server, and then make some of them
available as off-line files. When I go the Sync, most of the time the system
only asks me whether I want to save a newer file on the Laptop, rather than
allowing me to save the file on the server, which I know is the one I want to
keep. When this happens the options I have are:
1. Keep this file (Laptop version)
2. Delete in both locations.
This problem regularly makes me delete the latest version on the file
server, rather than keeping the server version.
What I want to be able to do on all occassions is "keep the file on the
server, and copy top both locations"
How do I change this?
Cheers,
Rod