You can find this week’s video here . IIS 7 has two application pool pipeline modes: Classic and Integrated. Using Integrated mode is the ideal since it allows forms authentication for all types of page requests—not just ASP.NET pages—has tighter integration
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Read the complete post at http://blogs.iis.net/owscott/archive/2011/12/05/iis-7-x-classic-and-integrated-pipeline-modes-week-43.aspx