Rated 5 out of 5 stars

This is literally the only required Thunderbolt add-on. Others are helpful and nice to have, but this is essential to my workflow of keeping all my mail sorted into about 3-4 main and 3-4 "extra" folders quickly and easily. It works wonderfully on Thunderbird 60, but not at all on anything newer. So, I have no idea how to downgrade the computer or two which I upgraded, but my others are now safely stuck on 60 until the author releases a new version. Unfortunately, he has said that is a big job, so it may never happen. Sigh. Thanks for this for 60 though!

This review is for a previous version of the add-on (1.4.11.11). 

A new version that works with Thunderbird 68 should be available soon. See https://github.com/adamroach/tb-archive-this/blob/master/tb68-update.md for details