well as someone said theys scripts and clients for msn to go tho IRC to msn chat servers.which aint legal done tho.using an illegal chat control blah blah anyhow
do u have a firewall by any chance? ive seen script kiddies go into msn chat rooms and post IP addy`s of chatters who didnt have firewalls but funny enough never posted ppl`s ip addy of ppl who had firewalls,

but are you sure someone told you your ip addy tho.since msn updated a few months ago
when you connect to msn chatroom at the top it says

Please wait, connecting to server...
Connected!
Welcome to MSN Chat. Important: MSN does not control or endorse the content, messages or information found in chat. MSN specifically disclaims any liability with regard to these areas. To review the guidelines for use of MSN Chat, go to http://groups.msn.com/conduct.

Note: MSN has detected that you are connected to this chat session from the IP address xxx.xxx.xx.xxx

are you sure yr not getting this confused with someone telling u.amazing how many done when msn updated they servers.lol