Since I use Opera Portable Personal ( http://www.kejut.com/operaportable ) I find it easy to use the built-in email client. I find the email client a bit more basic in the way of features, but eons ahead in the way of ease of use. I can simply click on someones name in my address book & every email & thread that they are in is INSTANTLY listed. Makes me irritated when I have to search thru outlook for work emails. Since they're integrated, sending links, etc via email is pretty seamless as well.
-DG