Thunderbird - A Free, Open Source, and Powerful Email Client

• Free: You already know that Thunderbird's free. That part's easy, and makes it something that is risk free to try and experiment with before deciding.

• Comfort: Most users of Outlook Express will actually feel very comfortable in Thunderbird. Basic operation is very similar.

• "... Thunderbird remains my recommended alternative to almost every other desktop email program."

  File Format: Thunderbird uses a standard, common plain text file format for its data store (mbox format, for the geeks among us). Many email programs use proprietary database formats that, quite frankly, seem prone to breaking and make it difficult to move from machine to machine. Thunderbird uses a simple on-disk folder structure that mirrors your email folder structure, and actual email is kept as plain text files. Moving your Thunderbird email from machine to machine is as simple as copying the folder tree.

• Cross-platform support: I've successfully moved my email not only between Windows PCs, but also to my Mac and to my Linux machines. As I said, transferring was a simple copy of all the folders and support information. The result was that not only did my email get transferred, but all the account settings, filters and even supported extensions were moved as well.

• Extensions: like its cousin FireFox, Thunderbird has a number of powerful Add-ons available. Examples include Lightning, the calendar add-on and the Google Calendar Provider, the Enigmail encryption add-on, QuickText which allows you to enter common responses with a single keystroke, and one of my favorites, Nostalgy which allows you to copy or move messages between folder extremely easily using the keyboard.

• Filters: Thunderbird supports a set of very powerful filters that allow you to have it take action automatically on mail as it arrives. For example, I have 37 separate filters that automatically sort incoming email and place it into various folders based on various criteria. Your needs may not be that complex, but simply being able to say things like "if this is from someone in my address book, move it into this folder" is a powerful way to prioritize your approach to email.

Naturally, there are many more features that may appeal to you. I encourage you to have a look.

Thunderbird is at version 2 and remains stable. Version 3 is underway with assorted features and enhancements, of course. But even at v2, Thunderbird remains my recommended alternative to almost every other desktop email program. (The sole exception would be Microsoft Outlook for the corporate and power user, but even then, I'm a power user, and have come to prefer Thunderbird anyway.)

If you don't already have a favorite (I acknowledge that email programs are often a personal, even passionate, decision), or you're struggling with the drawbacks of whatever program you're currently using, Thunderbird is worth a look.

I recommend it.