If you use thunderbird 3, you may have noticed an annoying link labeled 'more' on every address category (to, cc) after just 1 address is listed.
It is not smart to see if there is some more extra space to fit any more of the addresses in the category even if there is a tonne of space available.
First rule of thumb when you use mozilla products, check the configuration to see if you can increase this number from 1 to say 10 - meaning, show 10 addresses before you encapsulate the rest into the "more" container. Sadly, there was none.
Here is the hack to fix it.
Step 1: Find messenger.jar in your installation
ubuntu users: dpkg --search messenger.jar
other os users: I am sure you can find a way :)
The jar would be in the install location directory similar to:/usr/lib/thunderbird-3.0.2pre/chrome/messenger.jar
Step 2: Extract mailWidgets.xml from the jar
Step 3: Fix the hardcoded variable maxAddressesBeforeMore in the xml file
Step 4: Rezip it back.
Now, restart your thunderbird, and you should see 10 emails in each category before the "more" link shows up.
You are welcome!