HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedMar 26, 2013 7:17 PM (in response to danielm83)
Choose About this Mac from the Apple menu and check the processor.
If it's a G3, no further upgrades are available.
If it's a G4 or G5, buy a retail Mac OS X 10.5 DVD from a source such as Amazon or eBay; Apple still might have copies in stock if you phone them.
If it's an Intel Mac, buy a Mac OS X 10.6 DVD from the online Apple Store.
Currently Being ModeratedMar 28, 2013 2:12 PM (in response to danielm83)
You need Mac OS X v10.5.8 or later, and iTunes 10.6.3 or later.
Currently Being ModeratedMar 28, 2013 5:08 PM (in response to danielm83)
iTunes 10.6.3 is the last version of iTunes to support Mac computers with Mac OS X 10.5.8 or PowerPC processors.
iTunes 10.6.3 download: