Pfui - 12:46 am on Nov 15, 2011 (gmt 0)
1.) Are all the IPs bare/no rDNS, all .search.msn.com, or a mix?
2.) Are all the hits to public files? I ask because of:
Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
That robots.txt-ignoring, literally-waaay-outta-line, never-public URI is why neither 65.52. nor bingbot have carte blanche access. (Took me a while to recall why, @motorhaven:)