Bing & Yahoo Optimization (Local & Organic)

Hi All,
I have a client (dentist) that is ranking well on Google organic and places/maps - on the first page for his organic and local listings for his key term.
However, he ranks on the 2nd page of both Yahoo! and Bing for the same term.
First, does anyone know what percentage of the population uses all 3 engines? Last I read, it was 80% for Google.
Second, what would one have to do in order to rank in Bing and Yahoo's local and organic listings? Are the algos that different?
Thanks in advance for those that respond.

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