Differences Between IIS 6 and IIS 7+

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The concepts in both IIS versions are generally the same with the exception of WAS (Windows Process Activation Server) introduced in IIS 7+.

With reference to the following diagrams, the class/ object denoted in Green (Http.sys) runs in Kernel mode while the rest run in User mode.

IIS 6

The concepts are denoted in the following UML Class diagram:

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The delegation model is captured in the following UML Sequence diagram:

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IIS 7

The concepts are denoted in the following UML Class diagram:

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The delegation model is captured in the following UML Sequence diagram:

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