Windows 1.01

Windows 1.01 is the first retail Windows version released publicly, released on 1985-11-20 and discontinued on 2001-12-31. It was technically not an operating system of its own, but as described on the box, it is an operation environment application for MS-DOS. Windows 1.01 sold for $99 in the US, or about $224.32 in 2017 money.