Download .NET Framework 3.0 Service Pack 2 Update for Windows Server 2003 and Windows XP from Official Microsoft Download Center

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.NET Framework 3.0 Service Pack 2 Update for Windows Server 2003 and Windows XP

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There are some known incompatibilities in generic types using the BinaryFormatter or NetDataContractSerializer serialized and deserialized across a mixed .NET Framework 3.5 SP1 and .NET Framework 4 environment. Installing this update addresses these issues.