The rest of the story has emerged, from the guy who wrote the email (and notably didn't publish it himself). From http://www.phatbits.com/?p=3
" The responses are my personal impressions, communicated to my Microsoft recruiter in the context of a private 1:1 conversation. A few days after I sent my response to the recruiter, I saw an anonymized version floating around and being discussed inside Microsoft. I hadn't realized at the time that I wrote it that it would be distributed widely within Microsoft so that was a bit of a shock. "
