dstiles - 11:22 pm on Dec 15, 2012 (gmt 0)

Newbies - I suggest for a better over-view you read the Search Engine Spider and User Agent Identification forum - lots of recent stuff there about MSN/bing.

From my own viewpoint I see no more over-browsing than from googlebot.

If it's not a bot IP (check rDNS to see that) AND it's not a bot UA (there is only one I accept but there are two or three valid ones) then you should be rejecting access.