Windows RT's biggest weapon?
Microsoft just doesn't see the opportunity. In FACT, WinRT is a much better business tool than tablets running W8.
I mean, MO 2013 is generally not cheap to buy, or to pay for subscription.
BUT, here's what Microsoft could capitalize off, as seeing that tablets are the thing of today's techno world, and everyone is buying a tablet. Why not promote Microsoft Office 2013 as a feature for WinRT tablets?
You pay ~$200 for Microsoft Office 2013, and the Asus VivoTab RT only cost $399 + Free keyboard + free FULL Microsoft Office 2013.