Happy Birthday: Windows 3.1 is 25 years old April 7, 2017 by admin Tweet It was 25 years ago that Microsoft released Windows 3.1 and laid the foundation for the future of its operating systems. Today, Neowin pays homage to Microsoft’s last 16-bit operating system. Read more… Neowin Related Posts:A quick look back at the actual launch of Microsoft…A quick look back at the official announcement of…A quick look back at Windows 3.1 which hit the RTM…Windows 12? Microsoft goes back to releasing new…A quick look back at the launch of Windows NT 3.1,…