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Receptional_Andy - 9:17 am on Aug 17, 2007 (gmt 0)
I think it's some type of internal testing, although I haven't figured out of what. I think the actual referrer is faked.
I've seen a few of these, with searches for random keywords (one was 'sex' bizarrely) that could not have found the site in question. In each case, the IP of the visitor was owned by Microsoft.