Opera is more than just a browser. It also includes a mail and chat client that supports POP3, IMAP, SMTP, RSS, Atom and NNTP. Not only is Opera Mail one of the best clients I’ve seen, but it keeps getting better as you become used to it and learn about its features. And although I found it quite easy to use, you can take a look at the Opera Mail Tutorial to get started.
The Opera Web browser currently ranks third among browsers worldwide. The product of Opera Software of Norway, it was originally created for the Windows platform, but has since been rewritten to be easily portable to many different operating systems. It is currently available for Windows, Mac, OS/2, Linux, BeOS, BeIA, Symbian OS, and QNX.