Microsoft unveils Windows 8

Microsoft today let consumers start trying out its upcoming touch-based Windows 8 operating system, which aims to power a new wave of computer tablets and traditional PCs designed to counter Apple’s big gains in the market through its Macs and iPads.
The test “beta” version of the revamped system was introduced at the Mobile World Congress in Barcelona, the world’s largest mobile phone trade show, and borrows some of the look of Microsoft’s Windows Phone 7 software for Windows 8.