I currently have OS X Leopard on my iMac, wanting to upgrade to OS X Lion when it is released. It says on the Apple website that you must have OS X Snow Leopard in order to upgrade to Lion via the App Store. There really isn't any point in spending £25 on Snow Leopard and then a further £20 upgrading to Lion. Any way around this? The other thing is, my friend has a retail version of OS X Snow Leopard. I've heard it's technically possible to install the retail version on multiple machines, but it's not legal due to licensing, which is fair enough. Surely other people are having this problem? Or can you actually upgrade from Tiger and Leopard to Lion.