Hi Google and bing uses different algorithms for ranking, indexing. In the same way i can give you one example of my site. My site is on 1st position on keyword "Window security" in Google.co.uk but in Alexa it show ranking in below lakhs. So , every search engine has its own algorithm and policies. If your site get ranked in Google, this is the best. As most of the people searches through Google only. Hope, your query has been solved. Alex
Well Monishka, like humans, search engines also have their own ideas, thinking, the way of living, u will have more knowledge then me or less then me. But we both are wont be having the same thinking same ideas and knowledge. Like wise search engines also working related to human. Each and every search engines have their own algorithms to ranks and indexed sites in their engines. My suggestions is, Do your SEO activity only focusing to Google, Google is no 1 engine, searching peoples have using more that's the fact also. So don't bother about your site has not indexed in other search engines. All the best.....Keep on work with SEO.....