Other sources of Thunderbird information
From MozillaZine Knowledge Base
Introductory help/support
- Thunderbird Help at mozilla.org
- Introduction to Thunderbird
- MozillaZine Thunderbird support forum
- The website of the Italian Language MLP
Extensions and themes
- Sources for Thunderbird extensions
- Sources for Thunderbird themes
Other
- Wikipedia article on Thunderbird
- The Rumbling Edge: Weekly developments in Mozilla Thunderbird builds