Mozilla Thunderbird 3.0 Alpha 2

Mozilla Thunderbird is an open-source, free and cross-platform mail client and news reader for most modern operating systems including, but not limited to Windows, Macintosh and Linux.
It offers some advantages over other mail clients, including junk mail classification. Built from Mozilla code, Mozilla Thunderbird uses Gecko, the most standards-compliant rendering engine in existence.
In addition to the feature set found in Mozilla Mail, Thunderbird has several new features and improvements to make your mail and new experience better.
Main features:
- The ability to customize your toolbars the way you want them. Choose View / Toolbars / Customize inside any window.
- UI extensions can be added to Mozilla Thunderbird to customize your experience with specific features and enhancements that you need. Support for extensions. Extensions allow you to add features particular to your needs such as offline mail support. A full list of available extensions can be found here.
- A new look and feel. Thunderbird also supports a large number of downloadable themes which alter the appearance of the client.
- An addressing sidebar for mail compose which makes it easy and convenient to add address book contacts to emails.
- Online help includes a FAQ, tips and tricks and other useful information.
- Simplified preferences UI and menus.
- Footprint and performance improvements.
System requirements:
- 64 MB RAM (Recommended: 128 MB RAM or greater)
Note: You must delete your old Mozilla Thunderbird directory rather than just overwriting the files there. Not doing so WILL result in problems and you should not file any bugs on Mozilla Thunderbird unless youve first done a clean install.