iSync 2.0 features Reset Device and Reset All Devices functions that allow you to reset all the information on a connected device, or on all connected devices, to match the information on your computer.
When you select one of these options in iSync 2.0, iSync will display a dialog that asks you to verify your selection. Once you confirm it, the reset process begins and a "Cancel Sync" button appears. If you click "Cancel Sync," the reset gets deferred until the next sync. If you cancel because you want to preserve modified contacts on a device instead of resetting them to what's on the computer, do this before the next sync: