Thirty-one years ago on Monday, Microsoft introduced the first version of Windows, known as Windows 1.0.
The software wasn't officially released until 1985, but Gates took the wraps off Microsoft's first computer operating system during an event at New York City's Plaza Hotel on Nov. 10, 1983.
We've come a long way since then — three decades later, the Windows ecosystem has gone through about 15 iterations.
Here's a look at how Windows has changed throughout the years.Windows 1.0 (1985)
Windows 1.0 was officially released in 1985, two years after its introduction to the world. The company initially considered calling it "Interface Manager," but instead called it Windows after the format in which programs were designed.
Windows 2.0 (1987-1990)
The second iteration of Windows launched in 1987, and it introduced desktop icons, expanded memory, and the ability to overlap windows.
Windows 3.0 (1990)
When Windows 3.0 debuted in 1990, it became the most widely used version of the software yet. Microsoft sold 10 million copies of Windows 3.0 in its first two weeks. With Windows 3.0, Microsoft significantly enhanced the software's performance, improved app icons, and added 16 colors to its graphics.
Windows 95 (1995)
Windows 95 was one of Microsoft's most prominent software releases to date. The iconic Start button made its debut on Windows 95, as did Internet Explorer. Microsoft sold 7 million copies within its first five weeks of availability.
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