"How is that" clearly refers to Bing's response. I'll admit that I interpreted your post "I think this response is convincing" as referring to lysium's response

"How is that" clearly refers to Bing's response. I'll admit that I interpreted your post "I think this response is convincing" as referring to lysium's response to your post. It may have been clearer if you had written 'the response', or more directly, 'Microsoft/Bing's response'.