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Internet Information Services

Microsoft IIS (Internet Information Services, IIS, 2S) is an extensible web server created by Microsoft for use with the Windows NT family. IIS supports HTTP, HTTP/2, HTTP/3, HTTPS, FTP, FTPS, SMTP and NNTP. It has been an integral part of the Windows NT family since Windows NT 4.0, though it may be absent from some editions (e.g. Windows XP Home edition), and is not active by default. A dedicated suite of software called SEO Toolkit is included in the latest version of the manager. This suite has several tools for SEO with features for metatag / web coding optimization, sitemaps / robots.txt configuration, website analysis, crawler setting, SSL server-side configuration and more.

The first Microsoft web server was a research project at the European Microsoft Windows NT Academic Centre (EMWAC), part of the University of Edinburgh in Scotland, and was distributed as freeware. However, since the EMWAC server was unable to handle the volume of traffic going to Microsoft.com, Microsoft was forced to develop its own web server, IIS.

Almost every version of IIS was released either alongside or with a version of Microsoft Windows:

All versions of IIS prior to 7.0 running on client operating systems supported only 10 simultaneous connections and a single website.

Microsoft was criticized by vendors of other web server software, including O'Reilly & Associates and Netscape, for its licensing of early versions of Windows NT; the "Workstation" edition of the OS permitted only ten simultaneous TCP/IP connections, whereas the more expensive "Server" edition, which otherwise had few additional features, permitted unlimited connections but bundled IIS. It was implied that this was intended to discourage consumers from running alternative web server packages on the cheaper edition. Netscape wrote an open letter to the Antitrust Division of the U.S. Department of Justice regarding this distinction in product licensing, which it asserted had no technical merit. O'Reilly showed that the user could remove the enforced limits meant to cripple NT 4.0 Workstation as a web server with two registry key changes and other trivial configuration file tweaking.

IIS 6.0 and higher support the following authentication mechanisms:

IIS 7.0 has a modular architecture. Modules, also called extensions, can be added or removed individually so that only modules required for specific functionality have to be installed. IIS 7 includes native modules as part of the full installation. These modules are individual features that the server uses to process requests.

IIS 7.5 includes the following additional or enhanced security features:

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