1985: Windows - History of Desktop OSs
The first version of Windows (1.0) was announced in November 1985. Originally, Microsoft intended to use the name "Interface Manager", but decided to go with "Windows" due to visual appearance of the software. The company did not even call Windows an operating system, but as a graphical user interface (GUI) that runs on top of DOS and enables the user to run multiple applications simultaneously.
Reviewers at the time largely dismissed the viability and the idea behind Windows and described it as vaporware no one would want to use. The first commercial version of Windows was sold through retail for $99. Shortly after the release of the first Windows, Microsoft completed its initial public offering in 1986.