Back ويندوز إن تي 3.51 Arabic Windows NT 3.51 Azerbaijani Windows NT 3.51 Catalan Windows NT 3.51 Czech Microsoft Windows NT 3.51 German Windows NT 3.51 Greek Windows NT 3.51 Spanish Windows NT 3.51 Finnish विंडोज़ एन.टी. ३.५१ Hindi Windows NT 3.51 Hungarian
| Version of the Windows NT operating system | |
 | |
 | |
| Developer | Microsoft |
|---|---|
| Source model | Closed source |
| General availability | May 30, 1995[1] |
| Latest release | 3.51 (Build 1057: Service Pack 5) / September 19, 1996[1] |
| Marketing target | Business and Server |
| Platforms | IA-32, Alpha, MIPS, PowerPC |
| Kernel type | Hybrid |
| Userland | Windows API, NTVDM, OS/2 1.x, POSIX.1 |
| License | Commercial proprietary software |
| Preceded by | Windows NT 3.5 (1994) |
| Succeeded by | Windows NT 4.0 (1996) |
| Support status | |
| Server | Mainstream support ended on September 30, 2000[2] Extended support ended on September 30, 2002[2] |
| Workstation | Mainstream support ended on December 31, 2000[2] Extended support ended on December 31, 2001[2] |
Windows NT 3.51 is a major release of the Windows NT operating system developed by Microsoft and oriented towards businesses. It is the third version of Windows NT and was released on May 30, 1995, eight months following the release of Windows NT 3.5. The most significant enhancement offered in this release was that it provides client/server support for inter-operating with Windows 95, which was released almost three months after NT 3.51. Windows NT 4.0 became its successor a year later. Mainstream support for Windows NT 3.51 Workstation ended on December 31, 2000,[2] and extended support ended on December 31, 2001,[2] while Windows NT 3.51 Server mainstream support ended on September 30, 2000,[2] followed by extended support on September 30, 2002.[2] Both editions were succeeded by Windows NT 4.0 Workstation and Windows NT 4.0 Server, respectively.