Configuration files

[LeoTechnosoft]

The root configuration files (the machine.config file and the root Web.config file) for the .NET Framework and ASP.NET 4 have been updated to include most of the boilerplate configuration information that was found in the application Web.config files in ASP.NET 3.5. Because of the complexity of the managed IIS 7 and IIS 7.5 configuration systems, running ASP.NET 3.5 applications under ASP.NET 4 and under IIS 7 and IIS 7.5 can result in either ASP.NET errors or IIS errors.

 

[JohnH]

That is a quote from article: ASP.NET 4 Breaking Changes: The Official Microsoft ASP.NET Site
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