As we move into the post PC world the 2 biggest software companies have contrasting opinions on how to move forward. I think there are positives and negatives to each. Let's try to keep a civil discussion on each of the strategies and which you think is the winning style. Microsoft: One OS to rule them all. Will be more difficult to design the OS with both touch and mouse in mind. Will one size fits all, fit none? Apple: One OS for touch, One OS for laptops/desktops Needs to constantly be co-developing two separate OS's which could be a bit taxing on Apple's resources. Additionally 3rd party app devs would need to create an app for each OS. Things may not work as seamlessly between the tablet and laptop. But ideally each OS will be optimized for their respective functions so they will be lighter, simpler, and work better.