Interesting read ..

"Steve Ballmer had a dilemma. He had two groups at Microsoft pursuing competing visions for tablet computers.

One group, led by Xbox godfather J Allard, was pushing for a sleek, two-screen tablet called the Courier that users controlled with their finger or a pen. But it had a problem: It was running a modified version of Windows.

That ran headlong into the vision of tablet computing laid out by Steven Sinofsky ...."

http://news.cnet.com/8301-10805_3-20128013-75/the-inside-story-of-how-microsoft-killed-its-courier-tablet/