Windows NT 4.0 is a major release of the Windows NT operating system developed by Microsoft and oriented towards businesses. It was released to manufacturing on July 31, 1996, and was launched to retail on August 24, 1996, exactly one year after the release of its MS-DOS equivalent, Windows 95.
Microsoft ended mainstream support for Windows NT 4.0 Workstation on June 30, 2002, and ended extended support on June 30, 2004, while Windows NT 4.0 Server mainstream support ended on December 31, 2002, and extended support ended on December 31, 2004. Both editions were succeeded by Windows 2000 Professional and the Windows 2000 Server Family, respectively.
Windows NT 4.0 is the last public release of Windows for the Alpha, MIPS, and PowerPC architectures, and is also the last release where the desktop and server versions of Windows shared the same branding.
The successor to Windows NT 3.51, Windows NT 4.0 introduced the user interface of Windows 95 to the Windows NT family, including the Windows shell, File Explorer (known as Windows NT Explorer at the time), and the use of "My" nomenclature for shell folders (e.g. My Computer). It also includes most components introduced with Windows 95. Internally, Windows NT 4.0 was known as the Shell Update Release (SUR). While many administrative tools, notably User Manager for Domains, Server Manager and Domain Name Service Manager still used the old graphical user interfaces, the Start menu in Windows NT 4.0 separated the per-user shortcuts and folders from the shared shortcuts and folders by a separator line. Windows NT 4.0 includes some enhancements from Microsoft Plus! for Windows 95 such as the Space Cadet pinball table, font smoothing, showing window contents while dragging, high-color icons and stretching the wallpaper to fit the screen. Windows Desktop Update could also be installed on Windows NT 4.0 to update the shell version and install Task Scheduler. Windows NT 4.0 Resource Kit included the Desktop Themes utility.
Windows NT 4.0 is a preemptively multitasked, 32-bit operating system that is designed to work with either uniprocessor or symmetric multi-processor computers.
Windows NT 4.0 is the last major release of Microsoft Windows to support the Alpha, MIPS or PowerPC CPU architectures as Windows 2000 runs solely on IA-32 only. It remained in use by businesses for a number of years, despite Microsoft's many efforts to get customers to upgrade to Windows 2000 and newer versions. It was also the last release in the Windows NT family to be branded as Windows NT although Windows 2000 carried the designation "Built on NT Technology".