why are yahoo serp's & MSN's serp's different?

[Heywood_J]

Up until last week, they were almost identical. Something really fishy is going on with the Yahoo SERP's. I hope this is not a permanant algo change. I had a clean, well informed site with plenty of relevant links at the top of the yahoo results for all of my top search terms. Now, I'm no where to be found for any of them. There's spammy sites now on top of those top key word searches. But, I still rank well on MSN. I just hope MSN doesn't start posting the current SERP's yahoo is. Anyone else experiencing this?

[dertyfern]

I find them to be only very marginally different--most likely some minor tweaking by one of the search engines so that they don't appear to be indentical.

[Marval]

Might want to do a search here on MSN's new search engine - they have been developing their own and I wouldnt expect their results to ever be the same again