Little Machines, LLC produces O2M (Outlook 2 Mac), which is probably the most highly-regarded way to convert Microsoft Windows Outlook email, calendar and contact information so that it can be imported into Apple's Mail, Address Book, and iCal applications. It is thorough, reliable, and inexpensive, to boot.
Please note that O2M is a Windows program, not a Macintosh program. It runs on Windows and produces files that can be imported by Apple Mail, Address Book, and iCal.
Features include:
For more information about the compatibility of the exported files with your Mac applications, see the O2M web site.
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Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
Andrew Starr has a marvelous page of Eudora plug-ins and enhancements that Eudora users must check out. His entire site (known as eMailman) is worthwhile for every email junkie out there.
Graham Orndorff has written a superb collection of articles on setting up email servers and secure email clients on Mac OS X.
Adam Engst has put together a comprehensive overview of email attachment formats that is invaluable for anyone who wants or needs to understand the complexities behind them.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!