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This tag should have nothing to do with it. MSSmartTags was a highly controversial extension to Internet Explorer which Microsoft proposed a few years ago. The idea in short: when you visit a web page, IE would scan for certain words or phrases and highlight them distinctively (a bit like spelling and grammar errors are given a squiggly underline in MS Word), and link them to a network of sites– which most took to mean MSN advertisers.
The MSSmartTagsPreventParsing meta tag was the proposed mechanism whereby an author could block this behavior on his/her pages. As SmartTags were never implemented in IE 6, the meta is somewhat superfluous. But it should not have any impact on any search engines.