Windows Phone is a series of proprietary smartphone operating systems developed by Microsoft. It is the successor to Windows Mobile , [ 3] although it is inconsistent with previous platforms. [4] Its main target is the consumer market rather than the enterprise market. [5] It was first launched in October 2010 and released in early 2011 in Asia. The latest version of Windows Phone is Windows Phone 8 , launched on October 29, 2012.