I used to use MSN a lot. Back then there were many friends who used MSN so it was fun to have a group chat there. Eventually people got busier, me included, so I didn't sign in there for quite a long time now. Only once in a while when someone needed to talk to me or vice versa. Otherwise I use IRC or Skype. But I didn't use chat programs like that often lately, so yeah.
I still use msn till this day, i have been using it non-stop for about 5 years+ now i personally like it because a lot of people have it, the messenger is easy to use, i like the layout and most people that i meet online via games/forums/etc have it.