MozillaZine Forums - Thunderbird - Messages about bugs, features, builds, and the program in general. Mozilla.org: Thunderbird 1.0 Email Client Has Landed - Official press release covering the launch of version 1.0. Thunderbird on Wikipedia - In depth history and information Thunderbird Portable - Full featured version for portable devices such as USB drives The Rumbling Edge - Weblog about developments in the nightly builds. Thunderbird - 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. Open Source Articles - Detailed installation guides and tutorials for Thunderbird Thunderbird Knowledge Base - Has a variety of troubleshooting articles that help install, resolve and configure Thunderbird.