IIS 7.0 included a new modular design that allowed for a reduced attack surface and increased performance.

IIS 7.0 was a complete redesign and rewrite of IIS and was shipped with Windows Vista and Windows Server 2008.

Also each component (like for example Server Side Includes or ASP) now has to be explicitly installed, because in earlier versions often hackers entered sites by using security bugs of components that were not even in use by the hacked site, improving security. HTTP.sys was introduced in IIS 6.0 as an HTTP-specific protocol listener for HTTP requests.

IIS 6.0 included with Windows Server 2003 and Windows XP Professional 圆4 Edition, added support for IPv6 and included a new worker process model that increased security as well as reliability.

IIS 5.1 was shipped with Windows XP Professional and was nearly identical to IIS 5.0 on Windows 2000.

IIS 5.0 also dropped support for the Gopher protocol.

IIS 5.0 shipped with Windows 2000 and introduced additional authentication methods, support for the WebDAV protocol, and enhancements to ASP.

It was also the first version to run application pools. It introduced the new MMC-based administration application and also was the first version where you can run multiple instances of web and FTP servers, differentiating them by port number and/or hostname.

IIS 4.0 was released as part of the 'Option Pack' for Windows NT 4.0.

IIS 3.0, which was included with Service Pack 2 of Windows NT 4.0, introduced the Active Server Pages dynamic scripting environment.

IIS 2.0 was included with Windows NT 4.0.

IIS 1.0 was initially released as a free add-on for Windows NT 3.51.

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

However, since the EMWAC server was unable to handle the volume of traffic going to, Microsoft was forced to develop its own web server, IIS.

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. Windows XP Home edition), and is not active by default. 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. IIS supports HTTP, HTTP/2, HTTPS, FTP, FTPS, SMTP and NNTP. Internet Information Services (' 2S) is an extensible web server created by Microsoft for use with the Windows NT family.

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