◥◣◢ Get the IP address of msn user ◣◢◤

get him/her to use msn.
msn is direct connection. send them a file or get them to send you a file, then, as it is sending, goto start -> run
type cmd
press enter
type "netstat -a" without the quotation marks and you will see their ip in the active connection list (there ip is the number in the format xxx.xxx.xxx.xxx connected to the same port as the msn service (i think off hand it is 1863)