To crawl or not to crawl, that is BingBot’s question
Bingbot and robots.txt info along with how Bingbot handles the crawl delay function. http://www.bing.com/community/Site_Blogs/b/webmaster/archive/2012/05/03/to-crawl-or-not-to-crawl-that-is-bingbot-s-question.aspx

