in my opinion yahoo messenger is the best one among all the messenger it provide a lot of facility like chatting chatting room where you can chat with the people of your region also it give the video chatting with without interruption i like yahoo messenger.............
MSN is a necessity for me. I also use AIM from time to time, but it's not a must-have. As for Yahoo! messenger, I never use it; I only have a Yahoo! account for Yahoo Pool.