In Pictures: 12 things we know about Microsoft's n...
No traditional Windows apps
Because the Surface will be running Windows RT (which works only ARM processors), you won’t be able to install and run traditional Windows applications. However, apps written for the UI formerly known as Metro should work on computers or devices running either Windows RT or Windows 8. This would encourage third-party Windows developers to write apps specifically for Windows 8/RT instead of traditional Windows desktop applications, which users would buy at the Microsoft app store.
In Pictures: 12 things we know about Microsoft's new Surface Tablet (and one thing we don't)