Yahoo is converting their paid search customers to Bing/Microsoft adCenter. I just wanted to offer a tip: Before you switch to adCenter, you might want to use an adCenter credit to start an account with extra money in it. adCenter gives these credits to you one time for you to use when you first become an adCenter customer, so if your account is older than something like two weeks, it doesn't normally work. Maybe a converted account is considered new, I don't know, but I would just start an account first with the credit just to be safe. If you don't have a credit, you can get them on eBay for cheap.