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Windows NT 3.51 is the third major release of Microsoft's Windows NT line of operating systems. It was released onMay 30 1995, nine months after its predecessor, Windows NT 3.5. The release provided two notable feature improvements; firstly NT 3.51 was the first of ashort-lived outing of Microsoft Windows on the PowerPC CPU architecture. The second most significantenhancement offered through the release was that it provided client/server support for interoperating with Windows 95, which was released three months after NT 3.51. Windows NT4.0 became its successor a year later; Microsoft continued to support 3.51 until December31 2001.
OverviewThe release of Windows NT 3.51 was dubbed "the PowerPC release" at Microsoft. The original intention was to release a PowerPCedition of NT 3.5, but according to Microsoft's David Thompson, "we basically sat around for 9 months fixing bugs while wewaited for IBM to finish the Power PC hardware"[1]. Editions of NT 3.51 were also released for Intel'sx86, MIPS, and DECAlpha architectures.
Despite the significant difference in the kernel base, Windows NT 3.51 was readily able to run a large number ofWin32 applications designed for Windows 95. Despitethis, Microsoft in their application releases muddled the issue, releasing 32-bit versions ofMicrosoft Office right up to Office 97 SR2b, but relying upon 16-bit versions of Internet Explorer technology.
Microsoft also released test versions of a shell refresh, named the Shell Technology Preview. The update was designedto replace the Windows 3.x Program Manger/File Manager based shell with a WindowsExplorer-based graphical user interface. The release providedcapabilities quite similar to that of the Windows "Chicago" (codename for Windows 95) shell during its late beta phases, however was intended tobe nothing more than a test release[2]. Therewere two public releases of the Shell Technology Preview, made available to MSDN and CompuServe users; May26 1995 and August 8 1995.Both held Windows Explorer builds of 3.51.1053.1. The Shell Technology Preview program never saw a final release under NT 3.51.The entire program was moved across to the Cairo development group who finallyintegrated the new shell design into the NT code with the release of NT 4.0 in July 1996.
Five Service Packs were released for NT 3.51, which introduced both bug fixes and newfeatures. Service Pack 5, for example, fixed issues related to the Year 2000problem.
NT3.51 was the last of the series to run on a 386,and is in some ways the leastresource-hungry of the NT line. This, and its ability to run at leastsome of the common control API, means that it still finds aplace for occasional use on older machines. Private modifications(SuperPacks - see ref. below) to enable new features (forexample FAT32 partitions) are available.

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Windows NT 3.5 (originally codenamed Daytona) is the second release ofMicrosoft's Windows NT line of operating systems, and was released on September 211994.
OverviewThis is the first Windows NT to adopt the names Windows NT Workstation and Windows NT Server for its editions.The editions of the previous Windows NT release, Windows NT 3.1, were named WindowsNT and Windows NT Advanced Server. The screenshot shown is for the Windows NT Workstation release.
The new key features in Windows NT 3.5 included the new startup screen, no longer being a black DOS box lookalike and theinterface was changed to the same as that for the Windows for Workgroups 3.xx series to maintain consistency between thesetwo operating systems. It also included far better Object Linking andEmbedding (OLE) support and was more efficient - performance was higher and it required less memory.
In July 1995, Windows NT 3.5 with Service Pack 3 was rated by the National SecurityAgency as complying with TCSEC C2 criteria[1].
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• One of the primary goals during NT 3.5's development was to increase the speed of the operating system; as a result, theproject was given the codename "Daytona" in reference to the DaytonaInternational Speedway in Daytona Beach, Florida[2].
• The x86 version of Windows NT 3.5 will not work on a processor newer than theoriginal Pentium (P5 core). Pentium Pro, Pentium II, and later processors are not supported.[3]