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Login to Bing Webmaster Tools [ Use your live id to login, you don't have crate one.]
Then submit your site url to Bing
After verification of your website
Click on the web url appeard there [ http://www.domain.com]
Then click on Crawl
Then select Sitemaps [Atom, XML, RSS]
Then a window will appear and add your feed link or sitemap link with .xml as sitemap
Then click on submit
Finish !!!
Wait for a week and after that bing will index your site.