Microsoft IIS is the world's second most popular web server in terms of overall websites behind the industry leader Apache HTTP Server. Know how many version are available and its statistics Microsoft-IIS/6.0 Microsoft-IIS/5.0 Microsoft-IIS/7.0 Microsoft-IIS/7.5 Microsoft-IIS/4.0 Microsoft-IIS/6.5beta Microsoft-IIS Microsoft-IIS/5.1 Microsoft-IIS/6.0 Geobytes-GeoSelect Microsoft-IIS/3.0 Microsoft-IIS/5.0 Running XCache Version Microsoft-IIS/5.0 PHP Microsoft-IIS/5.0 node1 Apache linux Microsoft-IIS/5.0 PHP5.2 Microsoft-IIS/5.0 ASP.NET mod_ruby Microsoft-IIS/5.0 mod_perl Microsoft-IIS/6.0 on Windows Server 2003 Microsoft-IIS/6.0 mod_perl