Windows Phone 7 is Microsoft's complete do-over of its mobile operating system previously dubbed Windows Mobile. Microsoft established an early lead on mobility with its older mobile operating system, but in recent years the company has suffered substantial losses in market share.
Windows Mobile hasn't been upgraded substantially in several years, and more user-friendly competitors such as Apple's iPhone and Google's Android OS have taken market share away from Microsoft. As a result, Microsoft scrapped the Windows Mobile project and redid the entire OS into a tile-based interface incorporating elements of the Zune media player and Xbox Live gaming.
Though the company will announce details about Windows Phone 7 at the October 11 conference, multiple reports have claimed that the official shipping date of the first Windows Phone 7 devices is Nov. 8.