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Before installing this Silverlight 3 SDK, please remove any previous Silverlight 3 SDK install.
If you have installed or plan to install Microsoft Silverlight Tools for Visual Studio 2008, please skip installing the Silverlight SDK directly. Silverlight 3 SDK is installed by Microsoft Silverlight Tools. For more on that click
here.
To build Silverlight 3 applications, you can install Silverlight 3 for Developers
here.