For those you who are still in the stone age and haven’t discovered either GMail, Google Apps Mail or your own mail server, here’s how you access Yahoo Mail via IMAP:
Incoming: imap.next.mail.yahoo.com
Port: 993
Connection Security: SSL/TLS
Username: user@yahoo.com
Outgoing: smtp.mail.yahoo.com
Port: 465
Connection Security: SSL/TLS
Username: user@yahoo.com