I think in the business world the biggest thing that will hold Windows 8 RT back is the fact that you wont be able to add these devices to a domain. Speaking in terms of the Windows Surface Tablets that were announced I see the Pro edition being a better option for businesses simply because it will leverage existing applications and the new Metro apps. The big question though is what kind of battery life can we expect from the Pro edition. I have faith though that if Apple can claim up to 7 hours on their new Mac Book Pro that Microsoft can get good numbers on this tablet.