Once Bing took over MSN, my site dropped like a rock even though I am #1 in the SERPs in Google for my keywords. Two days ago I was on the bing webmaster tools and decided to try resubmitting my sitemap. Today I'm #1 in bing for all of my keywords. Don't know if this was just an accident, something wrong at my end, or if bing just didn't get my sitemap correctly when they made the switchover from MSN.
Give it a go. Nothing to lose!

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