I've used Palm Desktop on my G4 TiBook (OS 9.2.2) without a problem. No such luck on my G5 desktop (OS 10.4.1) though, as I can't even get the app to launch. The install seems to have gone OK, but double-clicking on the Palm Desktop app gets me an "unexpected end of file" error then the program quits. It's been over a year since the last update from Palm- you'd think they'd be "Tiger ready" by this point in time.