On April 6, 1992, Windows 3.1 was released to manufacturing. 32 years later, it has been recognized as a major addition to Microsoft's Windows operating system lineup and paved the way for Windows 95.
Windows 3.11 RSS
Legacy software is still a thing. At least on German railroads, where a Microsoft operating system from the early nineties still helps run the business. Although not a very timely one.