San Francisco – Microsoft announced that its Surface Pro, a version of its new tablet aimed at business users, would be available in January starting at $899 for US customers.The Surface Pro will be powered by an Intel processor and have a full version of the new Windows 8 operating system, which is designed with both PCs and tablets in mind."It's a full PC AND a tablet," said a blog post from Microsoft's Panos Panay."And all this in a PC that will weigh less than two pounds and be less than 14mm thick. We are excited about both Surface with Windows RT and Surface with Windows 8 Pro."Microsoft started selling the surface last month in a version aimed at consumers with a mobile-style processor and a tweaked version of its new operating system called Windows RT. The Surface Pro will be more expensive, and is apparently aimed at corporate users and those seeking a laptop replacement. The least expensive version with 64 gigabytes of memory will sell for $899, not including the touch cover with keyboard. A 128 GB version will start at $999."Surface with Windows 8 Pro uses the same familiar elegant design principles as Surface with Windows RT," Panay said.Chief executive Steve Ballmer has described the iPad challenger, complete with a built-in stand and ultra thin covers which double as keyboards in a range of colors, as a tablet that "works and plays."