Microsoft .NET Framework 3.5 contains many new features that are compatible with both .NET Framework 2.0 and .NET Framework 3.0. .NET Framework 3.5 includes servicing for .NET Framework 2.0 and .NET Framework 3.0.

.NET Framework 3.5 builds incrementally on the new features added in .NET Framework 3.0, for example, Windows Workflow Foundation (WF), Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF) and Windows CardSpace. In addition, .NET Framework 3.5 contains a number of new features in several technology areas. These new features have been added as new assemblies to avoid breaking changes.

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