not2easy - 12:32 am on Dec 20, 2012 (gmt 0)
"Mozilla/5.0 (compatible; bingbot/2.0; +h tt p://www.bing. com/bingbot.htm)" is the bingbot and "msnbot-media/1.1 (+h tt p://search.msn. com/msnbot.htm)" is the MSNBot that is currently grabbing images but is supposed be retired at some point.
(Using spaces to delink.)
Since they are compliant, blocking images in robots.txt is all you would need to do to cover blocking images from them both (along with all other compliant bots).
and the bing site says they follow wildcards.