On November 20, 1985, Microsoft shipped Windows 1.0, a then new operating system. Development took two years after the Windows announcement in 1983, leading skeptics to call it “vaporware.” See EDN‘s ...
Growing up using a PC that ran on Windows 3.1, I don't think it ever occurred to me that there was a Windows 2.1. Or 1.0. That was just Windows, until Windows 95 came around a few years later. But ...