I just purchased the Iphone 4 and when I went to plug the phone into my MacBook I reeived a message that I am currently running 10.4.11 and need to have 10.5.8 or higer in order to have the Iphone sync with itunes. I called Apple and they said I would need to buy the box set for $169. I really don't feel like spending that kind of cash on an old computer. I saw some posts saying I could just get the upgrade for $29. Does anyone have any experience with this or any information that would help me. I'm about to return the Iphone 4 if there isn't a cheaper solution.