I use PocketMac 3.12 on iMac G5 running OS 10.4.1 (Tiger). Yes, PocketMac is not perfect. Yes, PocketMac does not currently support categories for notes, etc. But, it works! And it creates a perfectly functional integration of iCal, AddressBook, Stickies, .mac mail, and entourage. It is also reasonably priced. I recommend trying it. I know others who use it and they too have enjoyed it's utility to the extent that is currently supported. Don't be afraid to try this software! Judge for yourself.