Thanks to Cult of Mac, we have a list of Macs that will not be able to run OS X 10.8 Mountain Lion. The reasoning is that the new OS needs a beefer graphics processor, one of which, these Macs do not have. I feel a little burned, as I have a 2007 Macbook that runs perfectly well and have had no reason to upgrade.
• Any Intel Core 2 Duo MacBook from late 2007 – late 2008 (Model Numbers: MB061*/B, MB062*/B, MB063*/B, MB402*/A MB403*/A MB404*/A, MB402*/B)
• The Mid-2007 Mac mini (Model Numbers: MB138*/A, MB139*/A)
• Late 2006 polycarbonate iMac (Model Number: MA710xx/A)
• The original early 2008 MacBook Air (Model Number: MB003LL/A)