My uncle is planning on getting windows 7, and i want to know if i can just borrow his copy and install it onto my computer. I’ve heard the “1 copy for 3 machines” rule from Microsoft before, but will it work for windows 7?

I am planning to pre-order a Windows 7 Ultimate upgrade download. I wasn’t sure if I bought one product key if would work on more than one computer.

I have Windows Vista Home Premium on my computer right now. It was pre-loaded on the machine. I’d like to upgrade it to Windows 7. I am also planning on buying a Mac. Will I be able to load the Windows 7 upgrade version on that also? Thanks in advance for your help.