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You can find developer versions under http://mozilla.paenglab.ch/
With version 1.14 I support only Thunderbird > 5.
Thunderbird 3 users can download version 1.13.1 under
See also the corresponding theme for Firefox https://addons.mozilla.org/en/firefox/addon/nuvola-ff/
This theme is mainly for TB 3 as I used rounded borders and TB 2 don't paint them with the right radius and backgrounds don't stop at them.