yahoo consider no difference between quality link and quantity link and give more weightage to keyowrds spamming so most of website will rank on yahoo well
Yahoo would count every links in it's database while google is selective on determining quality links.
My site below ranks #1 in Yahoo for the phrase "link exchange service" yet it is on page one of Google, however it is at the bottom of the page of Google for the same phrase. I think it takes several months normally to appear near the top, and one of my sites got to page one of Google in just a few months. Careful SEO without overdoing things and links help. Feel free to grab my free ebook available at my site.
In my case its easier to rank well at google then on MSN, but that could be that i always focused on G seo