Microsoft Windows 1.01 (pcjs.org)
Microsoft Windows 1.01, the first public version of Windows, was released on November 20, 1985. It is shown here running on an IBM PC XT (Model 5160) with an EGA Display. You can also run Windows 1.01 with a CGA Display. Or just for fun, on four machines simultaneously.- 1985 (Wikipedia)
1985 (MCMLXXXV) was a common year starting on Tuesday of the Gregorian calendar, the 1985th year of the Common Era (CE) and Anno Domini (AD) designations, the 985th year of the 2nd millennium, the 85th year of the 20th century, and the 6th year of the 1980s decade.