http://blogs.technet.com/b/port25/archive/2010/04/15/silverlight-4-ships.aspxby Peter Galli on April 15, 2010 05:29pm Silverlight 4 was released to the Web today. Developers can use Silverlight 4 to create great applications and rich, compelling user experiences, both on and off the Web. The release-to-the-Web edition can be downloadeden-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)