FastCGI module in IIS 7.0 has been lacking some of the features and bug fixes that are available in IIS 7.5 FastCGI module and in FastCGI Extension 1.5 on IIS 5.1 and IIS 6.0. The reason why this happened are explained in the post about FastCGI Module
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Read the complete post at http://blogs.iis.net/ruslany/archive/2010/03/10/important-update-for-iis-7-0-fastcgi-module.aspx