Rated 5 out of 5 stars

le Aaron W ar Aib. 28, 2010 · buan-nasc

This website describes how to make unselect message work in newer versions of thunderbird:

http://www.ghacks.net/2008/01/07/dont-jump-to-next-message-in-thunderbird-automatically/

It only took me a few minutes, and it worked like a charm!