Greetings, While preparing the backup of my profile folder, I have realized that there are several folders in my IMAP profile subfolder ( C:\Users\…\Thunderbird\Profiles\2mr7tdtg.default\ImapMail ) that exist in that folder and I don't understand what they do there. The "several folders" that I'm talking about are named after IMAP servers that I've used in the past. I believe, judging from the last modification timestamps of a few of them, that these folders match old accounts that I have deleted and, for some accounts, recreated for various reasons. I have 23 folders in the ImapMail folder while only having 5 current accounts in Thunderbird. Needless to say, those extra folders take up much space on my disk. I'd like to remove them as I don't understand why these folders and their contents aren't deleted when the account is removed from Thunderbird. Question: how do I know which folder is still active and which account it is linked to? Put differently, how do I know which folder holds the messages and data of a specific e-mail account? Thank you.