Windows 2.1x

Microsoft PC Operating Systems (17 items)
list by The O.P.

Windows 2.1x, marketed as Windows/286 and Windows/386, is a family of Microsoft Windows graphical user interface-based operating environments.
Windows/286 2.10 and Windows/386 2.10 were released on May 27, 1988, less than six months after the release of Windows 2.0. These versions can take advantage of the specific features of the Intel 80286 and Intel 80386 processors. A hard disk was required for the first time to install Windows.
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