folder synchronization Problem

we have upgraded to windows small business server 2003 with new server etc

for some reason when you log on or off the folders want to synchronize with
the old server (that is no longer there).

Have checked the local group policy and there is nothing in there about the
synchronisation locations
Have also gone through the registry deleting keys referring to the shared
folders on the old server but this doesn't work, when I reboot the shred
folder key recreates itself!!

Any ideas???

Cheers Ears
Pete