I have 10.3.9. I guess they decided only the newest Mac purchasers get to use the new ipods. Sort of sucks to bring the thing home, plug it in, and be denied. Now I have to decide if I want to pay $20 to return it, or put it on ebay. You know they could make it compatible with my OS if they wanted to. They just don't want to, because they think they can force me to update to a new OS this way. Is it my fault for not asking more questions at the store about whether it would work with my computer? Honestly, I bought into the hype of "it's a mac - stuff just works." I guess that line holds true for printers and cameras, but not with products actually made by Apple.