Toyo Snow has updated his Tiger Mail theme for Thunderbird, which aims to give it the look of OS 10.4’s Mail.app.
The new version (2.1) uses system fonts for cross-platform compatibility and will now highlight a selected header.
In keeping keeping with its attempts to reproduce the Mail 2.0 look, it now follows Mail.app’s default behaviour of bolding new messages.
A number of other small display glitches have been fixed.
The end result is not an exact match:
You can get the latest version from the Mozilla Thunderbird Add-ons site 
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“In keeping keeping with its attempts to reproduce the Mail 2.0 look, it now follows Mail.app’s default behaviour of bolding new messages.”
Does Mail.app do this? It doesn’t seem to on my install. How do you configure this preference?
If you are using Tiger Mail, Mail > Preferences > Viewing > Display unread messages with bold font
Ah I see. I had another font selected to display the email list, one that doesn’t have a ‘bold’ version. So it wasn’t displaying correctly. Silly me.
This is a windows screenshot, right? Anyway, I still prefer the Mail 1.0 looks that shipped with Panther, and I’ve modded my Mail 2.0 to use those icons instead.
Yes, it is a Windows screenshot. You’ve smoked me out!
I’m wilting under a heavy burden of freelance writing (like, for actual money!) at the moment and was too stretched for time to do the job properly. Apologies.
Hey, Tim, no big deal. I wasn’t complaining, just making sure. Does the same mod works on the Thunderbird for Mac? I’d believe so… I used to be a fan of Thunderbird on Windows and Linux, but now I find Mail.app more convenient. But I have to say, I’ve never ran Thunderbird on the Mac myself, so my opinion is not exactly unbiased, hehe
Yes, it does. At least the previous version worked fine.
See this post for a Mac screenshot of the earlier version ;-)
Still, no mac scrollbars and the open/close folder arrows are the same. Either way, still looks pretty nice!