I can confirm this, and it's a good example of Apple's deliberate obsolescence. The 2007 MacBook 3,1 model doesn't officially support Mountain Lion, but it can

I can confirm this, and it's a good example of Apple's deliberate obsolescence. The 2007 MacBook 3,1 model doesn't officially support Mountain Lion, but it can be hacked to run it perfectly fine (look up ML Postfactor). Apple removed drivers from the final Mountain Lion release that would have allowed it to run on that hardware. Those old plastic MacBooks (the original 2006 MacBook 1,1 and newer) can all run Windows 10 via Boot Camp. Installing Windows 10 will give those machines a new lease on life - various apps like Kindle & Chrome 32-bit are no longer supported / updated on those old Macs, but they'll run perfectly fine under Windows 10.