The SE market is a mature market. You can grow by "stealing" %share from other SEs or grow with the market growth rate. Making an existing "customer" switch "providers" however, takes more than some fancy advertising, so I reckon as long as Google doesn't do something stupid to alienate its users ... Bing won't have a chance to claim top place in SE for a long time.

Where it does have a chance however is the "new" users. If it can get as much as possible from that, it will have a higher growth rate than Google. But this takes time ...

By the way, what will make YOU switch SEs?

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