Microsoft develops, manufactures, licenses, and provides a broad range of computer software services. The best-selling products are Microsoft Windows operating system and Microsoft Office series of software. In October 2001, Microsoft released Windows XP, its most popular operating system to date. In the era of mobile Internet, Microsoft has not stopped the pace of innovation, in October 2010, the release of smart Phone operating system Windows Phone 7. The corresponding Windows Phone Store is a service provided by Microsoft for the Windows Phone platform, allowing its users to browse and download applications developed by third parties.