Source : Free On-Line Dictionary of Computing

Solaris
     
         {Sun Microsystems, Inc.}'s version of the
        {Unix} {operating system}.  As well as the core operating
        system, Solaris inludes networking software, the {Java Virtual
        Machine}, the {CDE}/Desktop that includes an {X11}-based
        {windowing environment} and {graphical user interface}.
     
        Sun claim that Solaris is not just an operating system but an
        "operating environment".
     
        Solaris 1.x was a retroactive (marketing?) name for {SunOS}
        4.1.x (where x>=1).
     
        Solaris 2.x (which is the first version most people call
        "Solaris") includes SunOS5.x, which is an SVR4-derived Unix,
        {OpenWindows} 3.x, and {tooltalk}.
     
        Version 2.7 ("Solaris 7") was around in 1999-03-02.  Version
        2.8 was released in June 2000.  Current version: 9, as of
        2002-07-15.
     
        {Home (http://www.sun.com/solaris/)}.
     
        (2002-07-15)