Hi, everybody !
I found a way to do it, there's a program who allow you to connect on your msn messenger session via mirc. It's a kind of server that you can create for more privacy or if you not able to do it there's public server. But your login/pass is logged on their servers. Anyway, once you are connected to the server, you have all your msn contact in 1 channel. You connect your psybnc to the server and then you'r always connected to msn....
Heres a link for the program :
http://www.bitlbee.org/main.php/news.html
Heres the guide :
http://linuxreviews.org/software/irc/bitlbee/
