Best Free Email Client

Email programs today are a much more sophisticated than they used to be. In addition to simply sending and receiving email, they now can manage your contacts and calendar, read news groups and RSS newsfeeds, and even integrate with various web-based mail systems like GMail and Hotmail.

[1] Mozilla Thunderbird
Website: http://www.mozilla.org/
Download Link: http://www.mozilla.org/products/thunderbird/
Author: Mozilla Corp.
Current Version: 2.0.0.9
Version date: 12/3/2007
License: Freeware - Mozilla Public License
Download file size: 6.4 MB
Operating Systems Supported: Windows 98-Vista, Mac OS-X, Various Linux Distros
Additional Software Required: None
64 Bit Capable: No
Portable Version Available: No
Non-English Languages Supported: Many: http://www.mozilla.com/en-US/thunderbird/all.html
Other relevant information:
Thunderbird Extensions: https://addons.mozilla.org/en-US/thunderbird
Webmail Plugin: http://webmail.mozdev.org/index.html
Guide for Migrating from Outlook to Thunderbird: http://opensourcearticles.com/introduction_to_thunderbird

[2] Foxmail
Website: http://fox.foxmail.com.cn/
Download Link: http://www.softpedia.com/get/Internet/E-mail/E-mail-Clients/Foxmail.shtml
Author: Foxmail
Current Version: 6.10.201.20
Version Date: 9/25/2007
License: Freeware
Download file size: 5.44 MB
Operating Systems Supported: Windows 95-Vista
Additional Software Required: None
64 Bit Capable: No
Portable Version Available: No
Non-English Languages Supported: Chinese
Other Relevant Information:
FoxMail English FAQ: http://www.hazeleger.net/psjs_faqs/index.html
Note: If after installing, the program comes up in Chinese, all you have to do is delete the file chinese.lgb in the installation folder. Developer's website is in Chinese.

[3] Opera (M2 Mail Client)
Website: http://www.opera.com/
Download Link: http://www.opera.com/download/
Author: Opera Software
Current Version: 9.25
Version Date: 1/15/2008
License: Free
Download file size: 4.7 MB
Operating Systems Supported: Windows 95-Vista, Mac OS 7.5-OS X, Various Linux Distros, OS/2, QNX, Various Mobile Phones, and Palm OS 5
Additional Software Required: None
64 Bit Capable: No
Portable Version Available: No
Non-English languages Supported: Many - Available via downloadable language files
Other relevant information:
Opera Language Files: http://www.opera.com/download/languagefiles/
Note: Runs as part of the Opera Web Browser