When was MS Windows operating system introduced?

When was MS Windows operating system introduced? Correct Answer 1985

Microsoft Windows is a group of several graphical operating system families, all of which are developed, marketed, and sold by Microsoft.
Microsoft introduced an operating environment named Windows on November 20, 1985, as a graphical operating system shell for MS-DOS in response to the growing interest in graphical user interfaces (GUIs).

Source : wikipedia.org

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