Using the right version of MSXML in Internet Explorer

Adam Wiener has a blog post that explains the often confusing issue of which version of the MSXML parser to use in Internet Explorer. The gist of the article is that you should try to use the latest version of MSXML (version 6) if it is installed on the client machine and fall back to MSXML version 3 if not. Trying to use other versions of MSXML leads to many problems as discussed in Adam's blog post. MSXML 6 is the preferred version since it has the best security, performance and reliability. MSXML 3 is the preferred fallback since it is installed on every Windows OS since Windows 2000 SP4 (i.e., zero deployment).

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[Source: Stuart Jones Weblog - Posted by Kishore Vengala]