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Learn how the Microsoft Silverlight 4 introduces the Managed Extensibility Framework (MEF) for building customizable applications that can easily be extended by third parties. Whether you are building an extensible data grid, a custom rules engine, a pluggable editor, or a composite application such as a pluggable CRM system, you want to learn about MEF. Hear how to use MEF to decouple your applications into more maintainable and testable pieces, and partition your application into dynamically deployable chunks that download on-demand.