Windows NT 3.x is the first system with a modern, hybrid kernel. The NT system's vulnerabilities were the drivers, difficult to program due to the advanced hardware abstraction model used in the system. The problem was solved only in the successor of the NT line, Windows 2000. Developers complained about difficulties in creating drivers for Windows NT, while hardware manufacturers claimed that creating drivers for their own devices is not profitable for such a small part of the computer market. In addition, despite better system performance and fuller use of hardware resources, the system has been working hard on weaker machines, demanding most of their resources. Windows NT was therefore designed to work on faster computers, which did not predestine it to be an environment for home users. An additional fact against suggesting such users to buy Windows NT was its user interface copied from version 3.1 and much poorer than Workplace Shell used in OS/2. However, the same features made Windows NT perfect for local area networks such as LAN, which in 1993 slowly became standard equipment for offices. Advanced network connection options and efficient NTFS file system made Windows NT 3.51 a bridgehead for Microsoft on the office systems market and gradually grew to Novell's disadvantage over the next few years.
Windows NT 3.1 was first to be called OS/2 3.0 as third version of operating system developed by Microsoft and IBM. However, when Windows 3.0 was released in May 1990, Microsoft decided to change its interface to Windows NT. This was the reason for the conflict between Microsoft and IBM, and its consequence was the breakup and termination of the cooperation. IBM has continued to develop OS/2 on its own since then, while Microsoft has started developing Windows NT 3.1 again. The first demonstration of Windows NT called "Windows Advanced Server for Lan Manager" took place at the developers' conference in August 1992 and the product was formally announced in spring 1993 at COMDEX in Atlanta, Georgia.
Windows NT 3.5 (also known as Daytona code name) - second release of Windows NT operating system. One of the main goals that the developers wanted to achieve while developing the system was to increase the speed of operation. This is the first version of NT, which adopted the names Windows NT Workstation and Windows NT Server. Previous editions of Windows NT (Windows NT 3.1) were called Windows NT and Windows NT Advanced Server. The novelty in Windows NT 3.5 was a new system loading screen and user interface taken over from Windows for Workgroups.