The Free On-line Dictionary of Computing (30 December 2018):

Internet Information Server
Microsoft IIS
Microsoft Internet Information Server

    (IIS) Microsoft's web server and FTP
   server for Windows NT.

   IIS is intended to meet the needs of a range of users: from
   workgroups and departments on a corporate intranet to ISPs
   hosting websites that receive millions of hits per day.

   Features include innovative web publishing, customisable
   tools, wizards, customisable management tools, flexible
   administration options, and analysis tools.

   IIS makes it easy to share documents and information across a
   company intranet or the Internet, and is completely
   integrated with Windows NT Directory Services.

   IIS 1.0 was released for Windows NT 3.51 and had a limited
   feature set.

   IIS 2.0 was released with Windows NT 4.0 with a similar
   feature set to IIS 1.0.

   IIS 3.0 quickly followed with many additions including
   Active Server Pages (ASP), ISAPI and ADO 1.0.

   IIS 4.0 is built into Windows NT Server 4.0.  It includes
   ASP 2.0, ISAPI and ADO 1.5.

   (http://microsoft.com/iis).

   Rival servers include Apache and Netscape Enterprise
   Server.

   (1999-08-04)