Microsoft Windows 8.1 Pro 32/64 Bits Full Retail Version for Windows online activation Windows 8's big trick was bringing Microsoft into the tablet era, with a more touch-friendly interface. That change involved what Microsoft then called the "Metro" interface and a new series of touch-ready apps for photos, video, mail, and music. Microsoft also included a built-in store for users to find and download new software. Microsoft didn't go all the way toward a touch-ready future,