A.
To provide the best support for our designers and developers there are two versions of Expression Blend available today. This enables our customers to use a fully supported design tool for their WPF and Silverlight work (Expression Blend 2) and retain the capability to build and test content for Microsoft’s pre-release platforms (Expression Blend 2.5 March 2008 Preview. For reference:
Expression Blend 2 supports creating content for Microsoft’s latest platforms, .NET Framework 3.0/3.5 and Silverlight 1.
Expression Blend 2.5 March 2008 Preview targets the creation of content for Silverlight 2 Beta 1, an early beta preview of Silverlight 2.