Hi Support, Trying to migrate from Thunderbird 91.8 on an iMac with iOS 10.13 to a MAC Mini M1 with iOS 12.3. Following all the instructions, but every time when I copy the old profile to the new, T-bird will start with all of the accounts in the proper order, When I go to download mail, it asks for security certificates for every account and will nor download email. When I exit Thunderbird and restart, about half the email accounts show up, The other inboxes are no longer marked as "Favorite Folder" and none of the Sent, Trash, or SPAM folders appear. I am out of ideas. My next step is to load a clean T-bird 91.9 and manually move al 40 email accounts and I really do not want to do that. Anyone with a solution? Thanks Walt Wise wpwise@comcast.net