This worked for me on win 2k to sync with outlook.
1) Uninstall everything from the windows desktop
2) Unplug the cradle
3) Make sure you use the uninstall program, then use windows Add/Remove software as well. You\'ll also need to uninstall the USB driver from the Add/Remove program
4) Check the device manager, usb section, for the SL driver and delete it there also.
Reboot.
1) Run setup from the 5600 supplied CD, install required software.
2) Shutdown.
3) Plug in cradle.
4) Power up PC.
5) Wait til windows is up, put z in cradle, power on.
6) Install USB drivers.
Should now work. Things that come to mind are version incompatibilities. Make sure that you use the USB drivers for your rom ver. They are not backwards compatible.
Good Luck!