1985 Windows 1.0 First retail shipment of the first Windows product;
required MS-DOS
1990 Windows 3.0 Improved performance and advanced ease-of-use;
required MS-DOS
1992 Windows 3.1 Widely adopted, commercially successful GUI with
more than 1,000 enhancements over 3.0;
required MS-DOS
1992 Windows for Workgroups GUI for small networks; required MS-DOS