Currently Being ModeratedAug 8, 2012 9:28 PM (in response to MatthewtheCalifornian)
No. iTunes 10 requires Mac OS X 10.5 or newer.
Currently Being ModeratedAug 9, 2012 7:06 AM (in response to MatthewtheCalifornian)
Expanding on what Niel said, you will need to upgrade your PowerMac to Mac OS X 10.5 to be able to run the necessary version of iTunes. You'll need to look for a retail copy of Mac OS X 10.5 on the open market such as on eBay (do not get the grey system disks from another model of Mac; they aren't legal and won't work). Your system will of course need to meet the minimum system requirements:
Currently Being ModeratedAug 9, 2012 8:42 PM (in response to varjak paw)
Thanks for your help.
Am I playing with fire to try to put an even newer OS on this old computer, or should it work fine? It's running pretty well with 10.4.11.
Currently Being ModeratedAug 10, 2012 6:34 AM (in response to MatthewtheCalifornian)
As long as it meets the system requirements and you don't have any applications or peripherals that would not be compatible with Mac OS X 10.5, you should be fine. My experience with Leopard (and I ran it on multiple G4s) was that it was an improvement over 10.4. Up to you, of course, but if you want to sync your iPhone with your PowerMac, you probably have no choice.