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I have installed the IIS Express 7.5 on Windows Server 2003 SP2 using Web Platform Installer But the Server is still running the IIS 6.0 when I run the IIS manager. Later I have installed IIS 7 Manager manually from here but I got this error

Could not connect to the specified computer.

Details: Impossible to load the file or assembly 'Microsoft.web.Administration, Version=, Culture=neutral, PublicKeyToken=###' or its dependencies. The specified file was not found.

Someone can tell me why or why what did I miss?

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IIS Express is a developer version of IIS. It started on demand, it will not run as a service and will only run a single website. Although it can run on W2K3 R2 it's not intended to replace IIS 6.0 and as you found out IIS 6.0 keeps running. IIS Express is basically just a simple application which you start to test a website / webapplication.

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