Walnut2 for Thunderbird, based on icons from art.gnome.org. Walnut2 is based on Walnut but with better looking wood panels. Fully compatible with from 5.0 upto latest nightly build (currently 27.0a1). Full support for Lightning/calendar.
Default XP theme for ThunderBird 45. (Mail and Lightning calendar) --- After long time of inactivity, Michal Stanke decided not to update xpDefault. I propose to try, and make this version, tested on Vista and Win 8.1. new 45.0.3 16 oct 2016