Sometime ago on another group someone mentioned a feature of 'outlook express' that highlighted unread threads in a different colour as well as being embolded. Thunderbird just has them in bold.
I had a look at this back then and found / edited this mod. Lately on reinstalling things I've realised how visually useful it was for me so I'll share.
First find your profile folder.
Create (if you don't already have one) a 'chrome' subfolder.
Copy the following lines as a new file in this folder, named 'userChrome.css'.
---------- copy lines below here ---------- @namespace url("
#threadTree > treechildren::-moz-tree-cell-text(unread) { color: DarkBlue !important; } #threadTree > treechildren::-moz-tree-cell-text(container, closed, hasUnread, read) { color: DarkBlue !important; }
---------- copy lines before here ----------
Restart Thunderbird, and you should find unreads are now coloured.
e&oe!