Answer to "Is it possible to upgrade a MacBook late 2007"If you mean Macbook White late 2007 so you can do upgrade to Lion 10.7.5, but if you want to do some geek trick you can upgrade it to Yosemite as I do. There is many tutorial you'll find on internet how to force upgrade unsupported OS to your MB white. I already try Mountain Lion, Maverick and Yosemite on my MB White late 2007. And yes it is just wasting your time because your hardware won't run optimal on those OS. So stay on Lion or Snow Leopard.