BING is a big joke ! I am doing seo for a very long time now. I rank more than 50 articles 1. page on Google search and 0 posts on Bing.
I think people there are incompotent when it comes to indexing.
Bing aperas hase old algoritam, only keywords work for it but if you use keywords Google will punish you so you have to choose. I choose Google until Bing gets it s@it together.