What exactly are you looking for in the release notes? Is there any question that we can help to answer?
As far as I know, MSXML3 and 6 are in-band with most versions of Windows, and MSXML5 is in-band with Office, so there may not be a separate release note. As to MSXML4, the release note can be found in Microsoft download center. For example: http://www.microsoft.com/download/en/details.aspx?id=15697
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