Hi guys, I'm thinking about buying an iMac for my parents for Christmas. I'm sure they will love the new iChat features with the shared desktop (whenever they have a problem or don't know how to do something). Since the iMac will be shipped with Leopard, I was wondering whether it would technically be feasible to upgrade my MacBook with the same DVD. Someone told me that there were different versions of Leopard for different machines, but I can't believe that is true. Is that so ?