Got a new Windows 11 PC -- and needed to move Thunderbird from old Windows 10. Initially used MozBackUp - which I know is a very old program and not really any longer supported -- but it had always continued to work as recent as about a year ago when a similar transfer had to be made - transferring everything. However this time (5-22) MozBackUp did not transfer everything. There are some folders/emails that did not properly transfer. Unfortunately the fact everything did not transfer was not immediately noticed -- and the computer user began to use the new Thunderbird install on the new Windows 11 --- gathering new emails/contacts. This means that it is not practical to delete this entire Thunderbird installation and use some alternative method to MozBackUp to try and move Thunderbird and get all files to move. I've looked into using the add on - 'ImportExportToolsNG' to see if it might be able to selectively export files that never moved the first try - and import them into the new Windows 11 Thunderbird -- but the how-to info is confusing about proper file types to export and be sure they will import and be readable within Thunderbird. Are there any really good explanation videos/instruction for 'ImportExportToolsNG' that are not old and outdated which cover the type of thing I need -- which is to selectively export and import only certain folders/files? Or is there another method to handle this better that I am not aware of?