As you can see on the right, I've got a nice banner for the Firefox web browser. This is an open source browser and it's really good. I finally ditched IE after it (or Office) messed up my settings -- now IE doesn't run anyways and I had to re-register all my applications.
Not only that, but there is a great mail client very similar to Outlook called Thunderbird. It's pretty good.
Click on the link. Check it out.