What is IIS?

Microsoft Internet Information Services (IIS, formerly called Internet Information Server) is a set of Internet-based services for servers using Microsoft Windows.

Debuting with Windows Vista, and also included in Windows Server 2008, IIS 7.0 features a modular architecture. Instead of a monolithic server which features all services, IIS 7 has a core web server engine. Modules offering specific functionality can be added to the engine to enable its features. The advantage of having this architecture is that only the features required can be enabled and that the functionalities can be extended by using custom modules.

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