I'm curious since the results for my site have dropped big time since i use adsense. Could that have something to do with it? Is msn saying "hey, you're using google adsense so we drop your pages in our index"?
I would doubt that would be the case. MSN is the second highest referrer for me stil and I run adsense.
I agree, shouldn't be an issue. I also do quite well with MSN search results despite running AdSense. So I think this is merely speculation.
I think MSN shouldn't be so popular if they ranked you lower then others if you used adsense on your pages... But it just kind of time before MSN is releasing some kind of ad system too...