Apparently MS didn't like the results of a search relevance study by Keynote, and they're trying to keep the results under wrap. They say it's because they don't agree with the methodology, but I think it's more a case of them not liking the results (or the cold hard facts they represent) -- that say MSN has dropped from 3rd to 5th best search engine in terms of relevance.
The numbers didn't look good for the home team in Redmond, the Wall Street Journal reported, and that may have led Microsoft to request the suppression of a search engine study. In the study, MSN Search fell to 5th from 3rd among 2,000 users surveyed in the second quarter of 2005.
I personally think MSN's results are great. Maybe that's because my sites are showing up at the top right now. I hope they don't make any drastic changes that make my sites submarine in the rankings.