The Microsoft Silverlight Tools for Visual Studio package is an add-on for Visual Studio 2010 to provide tooling for Microsoft Silverlight 5 Beta and Microsoft WCF RIA Services V1.0 SP2 Preview (April 2011).  It can be installed on top of either Visual Studio 2010 Service Pack 1 or Visual Web Developer 2010 Express Service Pack 1. It extends existing Silverlight 4 features and multitargeting capabilities in Visual Studio 2010 Service Pack 1 to also create applications for Silverlight 5 Beta using C# or Visual Basic.

This download will install all components necessary for Silverlight 5 Beta and Microsoft WCF RIA Services V1 SP2 Preview (April 2011) development:
- Silverlight 5 Beta Developer Runtime
- Silverlight 5 Beta SDK (software development kit)
- Update for Visual Studio 2010 Service Pack 1 and Visual Web Developer Express 2010 Service Pack 1 (KB2502836)
- Microsoft WCF RIA Services V1.0 SP2 Preview (April 2011)