Microsoft is currently experimenting with a free version of Windows 8.1 that could boost the number of people using the operating system. Sources familiar with Microsoft’s plans tell The Verge that the company is building "Windows 8.1 with Bing," a version that will bundle key Microsoft apps and services. While early versions of the software have leaked online, we understand that Windows 8.1 with Bing is an experimental project that aims to bring a low-cost version of Windows to consumers... We’re told that Microsoft is aiming to position Windows 8.1 with Bing as a free or low-cost upgrade for Windows...