I did a quick search and couldn't find this exact question, so here it is: I'm currently looking at upgrading to a MBP in the very near future. My HP laptop is >5 years old and I'm ready to make the switch after playing with my wife's MBP and taking the time to learn the OS (I fell in love). I'm not 100% sure that all the programs I use are Apple friendly, so I want to have Windows 7 as a backup. I purchased Windows 7 as an upgrade to my laptop last year. When I get my MBP I will part out my laptop, so can I use the copy of Windows that is currently on the laptop for Bootcamp? Will it trigger anything during the registration process that won't allow it due to be installed on a separate laptop? Or am I going to have to purchase another Windows 7 license? It's Windows 7 Professional 64 bit. Thanks in advance.