Seeking an edge in the crowded rich Internet application technology space, Microsoft is officially launching on Friday its Silverlight 3 platform, featuring offline capabilities for running applications outside of a browser and improvements in areas like 3D.

The company also will launch its Expression 3 technology for application design. Microsoft said that in conjunction with Microsoft's Visual Studio software development platform, Silverlight and Expression offer a collaborative development and design environment. Silverlight and its accompanying software development kit actually were made available earlier this week.

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