MSXML 4.0 Service Pack 3 (SP3) is a complete replacement of MSXML 4.0, MSXML 4.0 Service Pack 1 (SP1) and MSXML 4.0 Service Pack 2 (SP2). MSXML 4.0 SP3 provides a number of security and reliability bug fixes.

Support will end for MSXML 4.0 SP2 in November 2009. For more information about MSXML 4.0 SP3 see the release notes.

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