Source : Free On-Line Dictionary of Computing

Windows NT 3.5
     
         A much improved version of {Microsoft}'s
        {Windows NT 3.1}.  NT is now (July 1996) supplied as "Windows
        NT 3.5 Workstation" and "Windows NT 3.5 Server".  It has
        better {OLE} support, higher performance and requires less
        memory.
     
        (1996-07-08)