This 3 1/2" disk demonstrates the properties of version 3.1 of Windows, a graphical operating system sold by Microsoft. The program was first released in 1985 as an improvement of MS-DOS that featured ...

Microsoft sold Windows 3.0 for $149, but offered Windows 3.0 for $50 for those who owned a previous license, Wikipedia noted. Microsoft charged the same $149 for a retail copy of Windows 3.1.

New Technology LAN Manager, better known as NTLM, is an authentication protocol first released in 1993 as part of Windows NT 3.1 and as the successor to the LAN Manager (LM) protocol.