I realise that there are thousands of threads about upgrades already, but a search didn't yield any helpful results for my problem. I have three Macs in my household, one running Lion and two running Leopard (one is late 2007 and the other more recent). Once Mountain Lion is released I am looking to upgrade all three. What is the best way to do this? Will the ones running Leopard be able to support Mountain Lion? If so, do I have to buy all the intermediate versions? Is there a way of installing Snow Leopard without buying a disc? Is there a family licence available for Mountain Lion?