Rated 3 out of 5 stars

Beautiful
.. but
I used it for some years now with Thunderbird in German and today I finally found out that most of the things I hate about Thunderbird came from this theme!
- Size of the folder area changes with the headline (favorites, grouped, all), so the prev/next buttons move
- Size of the settings window is too small (using the German thunderbird), (and you can't resize it, like in original theme). Some settings in German are simply not visible
- Buttons in the news area (reply, forward, junk etc) move outside the window when you select more than one message

Had to de-install it and Thunderbird is much better without.

Needs to be tested and modified for other languages than English

This review is for a previous version of the add-on (1.4.1). 

Bugs

Hi jo.
- Size of the folder area changes with the headline (favorites, grouped, all), so the prev/next buttons move
This is because a bug I've reported on 2009-02-20: https://bugzilla.mozilla.org/show_bug.cgi?id=479457
This bug is already fixed for the next versions of Thunderbird.

- Size of the settings window is too small (using the German thunderbird), (and you can't resize it, like in original theme). Some settings in German are simply not visible
This can be possibly this bug: http://www.thunderbird-mail.de/forum/viewtopic.php?f=1&t=53752
Anyway, for this new version (1.4.2), I've modified strongly the way I'm calculating those heights, I guess everything should work better now. This is an issue we are discussing for a long time now on the German Forum... Too bad you didn't use the forum to report the bugs you are seeing...

- Buttons in the news area (reply, forward, junk etc) move outside the window when you select more than one message
Hopefully fixed in this new version.

Sorry, but I have to repeat what I've written for the last review:
Notice that every reviewer becomes this advice: "Please do not post bug reports in reviews. We do not make your email address available to add-on developers and they may need to contact you to help resolve your issue. See the support section to find out where to get assistance for this add-on."

I have links to three different forums in three different languages (Ja!!! Inklusive Deutsch) at my main page here at AMO and at my home page. I also have a public email address for support and I use to answer every single email I receive. So please, reviewers, use the forums or email to report bugs!!