Windows Sills

Windows Sills Is an operating system similar to Windows Vista, released the year before. Windows Sills is basically the OS between Windows Vista and Windows 7.

Features

 * Areo theme
 * Built in games (same as Vista's and 7's)
 * Several other themes that Vista didn't have
 * Gadgets
 * New default theme

More info

 * Released: November 29, 2008
 * SP1 Release date: May 10, 2009
 * SP2 Release date: October 1, 2010
 * End of Mainstream Support: December 13, 2014
 * End of Extended Support: December 14, 2019