Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It was originally designed to be a powerful high level language based processor independent multiprocessing multiuser operating system with features comparable to UNIX to complement workstation versions of Windows that were based on MS-DOS until 2001. It was the first 32-bit version of Windows. Since increases in processor performance, Windows XP and Windows Server 2003 are actually the latest versions of Windows NT, though they are not branded as such for marketing purposes.