I think Microsoft is inflating statistics, but not by multiplying numbers.
Remember that physics site that Bill put up a week ago, powered by Silverlight?
I noticed that when playback is active, it generates random hits to an obscure URL that redirects to bing (and returns a transparent GIF). It caught my eye in LiveHTTP headers because the URL contained words like Flash, Adobe, Silverlight, Windows Media, DRM, etc. stuff that really shouldn't have been coming from the site. I suspect that when we all went to the site the JS was active and all the slashdotters inadvertently helped Microsoft pump up their Bing search hits.
Oh and of course, stopping video playback stopped the search queries immediately.
This probably doesn't factor in Windows update changing the default search to Bing as well.
So divide the click through rate by maybe 3, or 5, and you'll get the true results.