Excellent open source Outlook Express alternatives are available which provide similar and additional features. Such is the case with Mozilla's Thunderbird, which is available for Windows, Mac, and Linux users. Moving away from Outlook Express is a no-brainer, as our screen shots illustrate.
This is the first of a two-part e-mail client comparison. In Part 1 our comparison is based on default installations of Outlook Express 6.0 and Thunderbird 1.0. In our upcoming Part 2 we will compare Outlook, Evolution and Kontact."