After installing the Freedom Keyboard driver, BTKeybd.prc, Entourage was unable to synch. Missing Sync describes the error as "unable to open handheld database" when attempting to synch the calendar/date book apps.

Removing the driver fixes the problem; adding it makes the problem return. There doesn't appear to be a new Mac-friendly driver available; I've contacted the company's tech support.

Of course I could be wrong, but caveat user...