I have an iBook G4 with a 1.42 GHz processor and 1 GB DDR SDRAM. I read on Apple's web site that I can run OSX 10.5.8 on my computer as well as a newer version of iTunes so that I can get a new iPhone 4S. BUT... the customer service person at both the Apple store AND MacMall both told me it wouldn't work on my current computer. I can afford a new phone but not a new computer. My current phone (iPhone 3G, 3.5 years old) is needing replacement (but still works). I don't want to replace the computer yet because it does everything I need it to do. Before I jump in and go on ahead and buy a newer, used computer, I thought I'd seek the wisdom of other consumers. Thanks!