Microsoft released the beta version of Silverlight 4 at PDC in November, 2009. On the 2nd day of Mix10, Microsoft announced the availability of the release candidate version of Silverlight 4 which comes with many new features which include better out-of-browser capability, powerful media and better tools to support Visual Studio and Express Blend.
As many people speculated, Microsoft declared Silverlight 4 as the functionality platform for Windows Phone 7 Series. Microsoft also unveiled Express Blend 4 beta which also adds support for Silverlight 4, .NET Framework 4 and Visual Studio 2010.
Silverlight 4 beta version has been released to public and is now available for download. Silverlight 4 promises to enhance the overall user experience, improving speed, performance and rendering for browsers.
This was announced and released yesterday at the day 2 of Microsoft Professional Developers Conference 2009 (PDC09).