Windows 7 was released to manufacturing on July 22, 2009, with a build number of 7600.16385.090713-1255. It was compiled on July 13, 2009.
New features in Windows 7 include an updated taskbar,called Superbar, mouse gestures for window management, a home networking system called HomeGroup, and a new data organizational feature, called Libraries.
Updated Calculator, Paint, and WordPad application interfaces
Libraries offer new ways to organize data
The new home networking system, HomeGroup
