Dawn
One of the big hold-ups in switching between email programs is converting all your address book entries between applications. If you choose the right combination of apps, you can occasionally switch your address book, but only if the stars are aligned with Mercury. Dawn acts as the go between for most address book formats, including Outlook, Eudora, Thunderbird, Opera, Palm, Pegasus, Juno and legacy formats like Corel WordPerfect Address Book and Pine. Instead of wasting time retyping or living with an inferior mail app rather than dealing with address book switching, Dawn makes the conversion process almost seamless. [Windows 9x/2k/XP $0.00]