Question
Most SEO's I speak to and it's something I have said. Optimize for Google and you'll be good in Bing and Yahoo.
In this case though something appears to be missing or preventing Bing positions.
Answer
Ensure you register with Bing Webmaster Tools to submit your site map would be a good first step. This will show you that the pages are being crawled by Bing and that there isn't some hinderance to that.
