Thunderbird Save
Official site. Open source cross-platform email and Usenet client based on Mozilla code. Features intelligent spam filters, built-in RSS reader, and quick search.
http://www.mozilla.com/thunderbird/   

BirdieSync Save
Pocket PC and Smartphone synchronization of cards, events, tasks and mails with Thunderbird, Lightning and Sunbird on ActiveSync and Windows Mobile Device Center.
http://www.birdiesync.com   

Lightning Save
Project to provide the functionality of the Sunbird calendar application as a thunderbird extension. Includes download and FAQs.
http://www.mozilla.org/projects/calen...   

Mozilla.org: Thunderbird 1.0 Email Client Has Landed Save
Official press release covering the launch of version 1.0.
http://www.mozilla.org/press/mozilla-...   

MozillaZine Forums - Thunderbird Save
Messages about bugs, features, builds, and the program in general.
http://forums.mozillazine.org/index.p...   

Open Source Articles Save
Detailed installation guides and tutorials for Thunderbird
http://opensourcearticles.com/thunder...   

The Mozilla Thunderbird Mail Project Save
Goal is to produce a cross platform stand alone mail application using the XUL user interface language.
http://www.mozilla.org/projects/thund...   

The Rumbling Edge Save
Weblog about developments in the nightly builds.
http://weblogs.mozillazine.org/rumbli...   

The Rumbling Edge Save
Weekly developments in Mozilla Thunderbird builds.
http://weblogs.mozillazine.org/rumbli...   

Thunderbird Extensions Save
Extensions are small add-ons that add new functionality to Thunderbird.
https://addons.mozilla.org/thunderbir...   

Thunderbird Portable Save
Full featured version for portable devices such as USB drives
http://portableapps.com/apps/internet...   

Thunderbird Themes Save
Themes are skins that allow you to change the look and feel of the browser and personalize it.
https://addons.mozilla.org/thunderbir...   

Thunderbird on Wikipedia Save
In depth history and information
http://en.wikipedia.org/wiki/Mozilla_...   

The Rumbling Edge
Weekly developments in Mozilla Thunderbird builds.

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