No doubt about it Windows Live Messenger is popular, almost everyone has a Windows Live ID & messenger is installed on almost every new computer. Thus making it an easy choice for most peoples IM needs.
However, there are still a lot of people who use another service, Microsoft connected Messenger to Yahoo’s IM service a while ago… Now they are ready to open it up to everyone.. and I do mean everyone
AOL, ICQ, Skype, Facebook & Google Talk are among the services mentioned in a leaked internal message to developers.