Version 78.2.2 is not working in IMAP. Somehow one person in my office had their Thunderbird auto update to Ver 78.2.2 and when it did, she was no longer able to send or receive emails. I had to do a system restore on her entire computer to roll back to a previous version. I accidentally updated mine to Ver 78.2.2 when I clicked "About" to find my version. But since mine is set-up as POP3 account, it did not disable my send/receive abilities. At least I believe that is why mine still worked after the update and hers did not. Also, I completely dislike the folder tree on the left side of the screen. It used to have easy to recognize folder icons. Now all the folders are static outlines of a folder. And to make it worse, the folder icon is bolder than the text info, so those folder icons kind of glare at you. If you are going to minimize the folder appearance by removing the manila coloring, at least do not use a bold outline of a folder. Also, I would prefer when using the option to add a color to a folder that the color be a fill as they were in Ver68, rather than a stroke in Ver 78. I've attached screen shots from two different computers so you can see the difference between the two version trees and appearance. Additionally, I noticed at the bottom of the open email on Ver 78, this message: "Quick Reply is temporarily disabled due to needing rewriting for Thunderbird 68+." I used to have a delete shortcut on the menu bar, when I try to add it from customize it is grayed out and not letting me use it. It would be nice if I could roll back my version of Thunderbird to a previous one without having to do an entire system restore of my computer. However, there are some things I like better, conversational view is great in that it shows what folders the rest of the conversation resides in. Some of the things I used to have to go to the task bar for are right there in the email, like source and header views. There might be other things that might make it more useful. Will know more as I use it for a few days/weeks. S.