I currently have a mid 2007 macbook pro that originally came with the Tiger OS. I have since upgraded to Leopard. I'm planning on buying a newer model macbook pro in the near future, probably while Leopard is still the default OS. I'm planning on wiping my old macbook pro, installing tiger, and giving it to a family member. Im curious, after i get my new MBP and use the up to date program to get the snow leopard CD, will i be able to install snow leopard on my new MBP & upgrade the old one from tiger to snow leopard? Thanks for your help!