IIS 7 and Above
Known Issues and Workarounds
ASP.NET: AspCompat does not work within Integrated Mode applications
Last post Dec 17, 2007 11:53 AM by stmcdani
May 25, 2006 04:58 PM|JWilcox|LINK
AspCompat does not work on IIS7 as of beta 2 (Vista and Longhorn Server) when applications are running within the Integrated Pipeline Mode.
Use ISAPI mode (Classic .NET AppPool) instead of the Integrated pipeline mode for any applications that use AspCompat.
Dec 17, 2007 11:53 AM|stmcdani|LINK
Although I am seeing other problems in IIS 7.0 using both Classic and Integrated, many of my pages that use AspCompat seem to work just fine.