Recently a friend bought an iPhone 4. Unfortunately, she has a Mac G5 tower running Tiger which we found out won't sync to her iPhone via iTunes because the system is too old - has to be Leopard or Snow Leopard. And since Apple only sells it's latest operating systems, off to eBay I went to find a Leopard disc. Much to my surprise, they're going for around $150 used! This for a four year old system that sold originally in 2007 for $129. Yikes! Must be lots of people with iPhones that need syncing.