The first release version of Windows 2.0 was
actually numbered 2.03
Windows 2.03 was a 16-bit Microsoft Windows
graphical user interface-based operating
environment that superseded Windows 1.0
Windows 2.03 was supplemented by Windows/286
and Windows/386 in 1988.
Windows 2.03, Windows/286, and Windows/386 were
superseded by Windows 3.0 in May 1990.