Windows 8 is on the horizon. Microsoft has designed the next-generation flagship operating system with a split personality that straddles the line between the familiar Windows 7 desktop, and the flashy Metro interface used with Windows Phone 7. Can Microsoft successfully tackle desktop and mobile with one OS?

Microsoft is not new to mobile devices. It had a smartphone before the Apple iPhone revolution came along, and it was pushing tablet PCs before the Apple iPad made it cool. But, as long as Microsoft’s history with mobile devices is, so is its stubborn desire to make everything about its Windows OS.