Having updated to 140.2.1 there are two Outboxes in my local data. They are both named Outbox but one refers to a location of "Outbox" and the other to a location of "Unsent messages". The former is the location where messages to be sent should go, the latter is the location used in previous versions of Thunderbird. Unfortunately Thunderbird is putting messages in the latter. Not only does this mean that my Thunderbird does not match the documentation but also the Send Later addon uses the former and is therefore not working. This seems to be an error in the update process. How can I get Thunderbird to use the correct location ("Outbox")? I can find nothing in prefs.js that relates to the location of the Outbox ... surely it can't be hard coded!