NT5/Windows 2000 was a huge leap forward for Microsoft in terms of design model and security. NT5.1/Windows XP had some iterative improvements and some things g

NT5/Windows 2000 was a huge leap forward for Microsoft in terms of design model and security. NT5.1/Windows XP had some iterative improvements and some things going backwards. NT4 was better than 95 in every way, but was merely mediocre. Microsoft's suite of workplace tools that ran on NT4 were janky and broken, requiring their own college degree to set up and administer, but they also represented a real productivity boost for many teams.