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Windows NT 3.1

Operating system
Windows NT 3.1 is the first major release of the Windows NT operating system developed by Microsoft, released on July 27, 1993. Wikipedia
Initial release date: July 27, 1993
Developer: Microsoft
Latest release: Service Pack 3 (3.1.528) / October 29, 1994; 29 years ago
Platforms: IA-32, Alpha, MIPS
Source model: Closed-source