When migrating an IIS6 website to IIS7 you probably want to keep an existing UrlRewriter.NET configuration and migrate to the official Microsoft URL Rewriter Module for IIS 7 later on.

Here is the important excerpt from „Web.config“:

<system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
        <add name="UrlRewriter"
            type="Intelligencia.UrlRewriter.RewriterHttpModule" />
    </modules>
</system.webServer>

Thanks to Rainer who figured this out from this posting.

Another good discussion can be found in the article „Wildcard script mapping and IIS 7 integrated pipeline“ on the IIS website and the article „Use a Single Web.Config for IIS6 and IIS7„.