Windows NT 3.51  Windows NT 3.51 is the third release of Microsoft's Windows NT line of operating systems. It was released on May 30, 1995, nine months after the release of Windows NT 3.5, and three months before the release of Windows 95. The release provided two notable feature improvements; firstly NT 3.51 was the first of a short-lived outing of Microsoft Windows on the PowerPC architecture. The second most significant enhancement offered through the release was that it provides client/server support for inter-operating with Windows 95, which was released three months after NT 3.51. Windows NT 4.0 became its successor a year later. Support for NT 3.51 ended in 2001 and 2002 for the Workstation and Server editions, respectively. The release of Windows NT 3.51 was dubbed "the PowerPC release" at Microsoft. The original intention was to release a PowerPC edition of NT 3.5, but according to Microsoft's David Thompson, ""we basically sat around for 9 months fixing bugs while we waited for IBM to finish the Power PC hardware"". Editions of NT 3.51 were also released for the x86, MIPS, and Alpha architectures. New features introduced in Windows NT 3.51 include PCMCIA support, NTFS file compression, replaceable WinLogon (GINA), 3D support in OpenGL, persistent IP routes when using TCP/IP, automatic display of textual descriptions when the mouse pointer was placed on toolbar buttons ("tooltips") and support for Windows 95 common controls. In view of the significant difference in the kernel base, Windows NT 3.51 is readily able to run a large number of Win32 applications designed for Windows 95. More recent 32-bit applications will not work, as the developers have prevented their application from working with any Windows version earlier than Windows 98, and also because some applications do not work properly with the older Windows NT 3.51 interface. Despite this, Microsoft in their application releases muddied the issue, releasing 32-bit versions of Microsoft Office right up to Office 97 (the last version of Microsoft Office supported on NT 3.51), but relying upon 16-bit versions of Internet Explorer technology from versions 3.0 to 5.0. Web browsers based on and including Firefox were operable up to version 2.0.0.22, released in April 2009; they required a few manual file updates to work without compromising browsing security. Windows NT 3.51 is the last of the series to be compatible with the Intel 80386 processor.