Microsoft, Yahoo to Take on Google With Search Deal

Advertising Age: "Through the pact, Bing will become the default search engine on Yahoo, creating a search player with close to 30% market share of search queries, compared with Google's 65%, according to ComScore data.

One of the most interesting wrinkles involves who takes ownership of search sales: Yahoo is likely to take on exclusive representation of Bing inventory to eliminate channel conflict and complexity for advertisers, but not before both sides unwind the thousands of advertiser relationships and proprietary systems through which many large advertisers buy search ads. Microsoft's AdCenter is expected to be the sales-technology platform."