For many years I have enjoyed using Mozilla Firefox Web Browser and Mozilla Thunderbird email client. Apart from the occasional glitch, everything has run well until I installed the latest Thunderbird Version 128.1 esr, earlier this month. I had used Message Filters to move inbox emails directly into my Local Folders. Now there is no option to either create a new folder or create a new sub folder. I tried to convert a little used Local Folder, and lost the sub folders. I don't know where they went and cannot restore them. Q1. I just do not understand how to use this new version. Do Mozilla have an instruction manual for using the V128.1 esr? How do I alter the previous version installation to be compatible with this one? Q 2. If, for the time being, I would like to stick with the familiar previous version, how do I do that? Mozilla are convinced V128.1 esr is a big step forward. I need your help to convince me to change and how to do it. Regards, Colin