I have tried the various solutions posted online to change the order of email accounts in Thunderbird (e.g., drag and drop the account in the place/order desire; click Shift and drag and drop the account; click CTRL and the down/up bottom to move the account), and none seem to stick. I can move the accounts in the Settings option, but that doesn't result in the accounts actually moving in Thunderbird. Also, when I restart Thunderbird, the accounts are in their old order in the Account Settings options, and have been unaffected by any changes made previously. If anyone has any solutions, I'd greatly appreciate hearing them.