Silverlight is a cross-browser, cross-platform plug-in for delivering the next generation of Microsoft .NET-based media experiences and rich interactive applications for the Web.
Full Specifications
What's new in version 4.0.60531.0
General
ReleaseJune 25, 2011
Date AddedJune 25, 2011
Version4.0.60531.0
Operating Systems
Operating SystemsMacintosh, Mac OS X 10.4 Intel, Mac OS X 10.5 Intel, Mac OS X 10.6 Intel