This is need-to-know information, great article by Mike Volodarsky (IIS.net) Note: Discountasp.net provides us with an option in the Control Panel to change Integrated mode. The article below does however list significant changes in regards to ASP.NET 2.0 on IIS7. ASP.NET 2.0 Breaking Changes on IIS 7.0 http://learn.iis.net/page.aspx/381/aspnet-20-breaking-changes-on-iis-70/