Long, long ago, in an age where there was only the "big three", MSN was powered by Inktomi. If you want to step back in the past - it has been a month now? - and see the old MSN, visit http://sea.search.msn.com/. It is currently showing Inktomi (known as Yahoo! Search) results at that special URL. The new MSN is its own beast and has its own results.
Forum discussion at SEO Chat Forums.