Forum Moderators: open
202.96.51.151 bot/1.0
Doing a whois shows it is a "Microsoft" bot. It even has a @microsoft.com email and is described as Microsoft China Co. Definitely not MS China IMO.
IP range: 202.96.51.128 - 202.96.51.255
I've seen several odd things coming out of MS in the U.S. so this wouldn't surprise me to be MS China as it could be something someone is testing.
[webmasterworld.com...]
403
202.96.51.155 as msnbot/1.0 (+http://search.msn.com/msnbot.htm)
202.96.51.150 as bot/1.0
same 403