Hello, We are using Thunderbird since version 45, and we updated it last month to version 68. Now we are updating some installations to the version 78 and 78.0.1 but we can't manage to get an IMAP account working. -- Problem-- Before version 78 you are prompted an exception to accept the incoming and outgoing server, but we don't get the window at version 78. This means we cannot send or receive email with version 78. I tested this with both Windows and Mac --Possible workaround -- When we update an installation of version 68 to 78 that was already configured on version 68, version 78 works fine. In the attachment are 2 pictures of the exception and what happens on version 78. Thank you in advance!