I think that there have been certain suggestions from something Ash said once... But I'm not sure if its entirely possible to do so, it may be, but converting an msn area into a chatroom would take a long time, and would be really complicated...
There is a mIRC script that allows you to sign in to MSN trough mIRC but you want it the other way around and i do not think that's really posible (in a stable way).
I haven't been active here in ages.
If you're wondering who i am, read my reputations. I used to make plugins, skins and spam the IRC channels here back in the good old days before Windows Live.