The first name in mail service provider is obviously hotmail and then Yahoo!
It has very good personalised services. Configuration of services is so easy..it can be easily configured in outlook express......one can even read your messeges and also write offline.
Yahoo messenger is yet another big boom.....It makes easy communication for busy as well as lazy people.......and you can transfer files also....
Many more services are available who wants to reall use or make good use of internet communication facilties.......Not to be missed by any one who uses internet for watever reasons or jobs......