Thunderbird clumps together emails in a string, which results in several annoying things. a) You can't immediately see who the latest email is from. b) When you open the string all the emails open up and you then have to close them one by one, which wastes time. c) Thunderbird sometimes clumps unrelated emails into a string, making it hard to track responses and find original attachments to earlier emails wrongly associated. I find all this completely useless and preferred when I could sort by subject line, sender or date. Sooo much easier! How can I go back to that?