[issue]
AspCompat does not work on IIS7 as of beta 2 (Vista and Longhorn Server) when applications are running within the Integrated Pipeline Mode.
[workarounds]
Use ISAPI mode (Classic .NET AppPool) instead of the Integrated pipeline mode for any applications that use AspCompat.
Jeff Wilcox [MSFT]
SDET - UIFx Silverlight Team
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