I have one main email address plus several others. Usually when I log on to Thunderbird all the four email adresses, each with with its own set of subfolders appears on the opening Thunderbird screen on a vertical panel on the left. I can then click on to any of the four and see their incoming and sent messages. This has worked well for some years. Yesterday, for no reason I can think of, only the main email (with its subfolders) appears. I cannot make the others re-appear, although I know they received emails in the last few hours. Please help Dumbfounded