That Apple is looking to upstage the PC giant becomes evident when we consider that Microsoft is launching its own tablet PC, the Surface Pro, in a couple of days.

FORBES: Apple's New iPad Takes On Microsoft As Tablets Nab PC Sales

Microsoft Surface is a tablet and PC all-in-one, which solves many problems affecting more traditional tablets.

FORBES: Tablets Are So Last Year

Microsoft five years ago introduced the Tablet PC, which features a large screen that can be controlled with a stylus rather than a keyboard.

WSJ: The Shape of Computers to Come?