Up until about a week ago I was using Internet Explorer 6.0 then some here mentioned Mozilla so I figured I'd give it a whirl since I haven't used it in about eight years or so... I like it tons better than IE6.0 there's no comparison for me really.

Some of my favorite features of Mozilla 1.4 Browser versus IE6.0 are:
The ability to use "Tabs" for web pages and "Windows". IE6.0 only allows Windows.
I like the bookmarks at the top of the page instead of the "Favorites" pane.
The included pop-up blocker.
The password managers seems to be more intuitive than IE6.0

A few favorites of Mozilla 1.4 email versus Outlook XP:
You can thread your emails so when a bunch of your buddies start arguing over something silly back and forth you can simply collapse the thead.
You can actually right click a hyperlink in an email and open it in a "New Tab" or Window; no more losing the page you were just on!
A very simple and straight forward way to handle multiple email acounts!