Ranked in these QuestionsQuestion Ranking
Pro PHP spport
PHP applications can be run using IIS. Simple to install and configure.
Pro .NET and ASPX script support
Pro Supported by Microsoft
Pro Authentication (Anonymous, Basic, Digest, Integrated Windows Auth, UNC, .NET Passport (<6), Certificate)
Pro IPv6 support (IIS 6+)
Pro Multiple websites can be run on 1 server
Pro HTTP/2, HTTP/2, HTTPS, FTP, FTPS, SMTP and NNTP support
Pro Runs on literal NT 3.51
So you can boot up that ancient work computer and get IIS (Free addon at the time) for that computer
Pro Very fast
If you want a quick web server, use this, because i mean like, on my laptop, the first request is 1 or 2 seconds, after that, it becomes a split second!
Pro In-depth diagnostic tools
Con 1 website limit per server (also pre-7.0 client os limit)
Con 10 simultaneous connection limit on versions before 7.0 on client operating systems
Con Only runs on Windows
This Microsoft-proprietary web server software, can only run in the Windows operating systems for full support of it and all of its features. It is not capable of being run in a non-Windows environment without sacrificing some functionality and of course the support.