Steven Sinofsky, president of Microsoft's Windows division, introduces the company's new tablet computer "Surface" at a media preview in Shanghai, east China, Oct. 23, 2012. Microsoft officially started a series of global celebrations for the launch of its Windows 8 system on Tuesday in Shanghai, making the Chinese economic center the world's first showcase for the IT giant's new software product. Microsoft will launch Windows 8 and the Surface tablet computer in China on Friday. [Xinhua]