MSN, which Microsoft says now has 600 million users globally (which would make it larger than Yahoo), is a huge asset for a number of reasons, not the least of which is the fact that it drives roughly 45% of Bing’s queries.
http://searchengineland.com/msn-introduces-dramatically-improved-redesign-portal-drives-nearly-50-of-bing-queries-29118
Mid Sized SEO Monopoly networks generally run under 1k/Month and include 5-10 new sites and SEO campaigns in your niche.