Sure, there are add on emulation/virtualization software, but even built in backward compatibility is impressive. That's important for casual users with limited

Sure, there are add on emulation/virtualization software, but even built in backward compatibility is impressive. That's important for casual users with limited computer skills, system administrators who don't have to manage another level of abstraction, those on a budget who don't have to pay for an extra license just to run software they already own...