You can no longer receive or send emails? You are encountering synchronization errors with your contacts & calendars? Follow the instructions in this guide to delete the problematic accounts and reconfigure them correctly.

Preamble

• The following instructions are provided for informational purposes only. Please contact the software publisher in case of any issues.
• Follow these instructions only to delete an email account configured in IMAP (and not in POP3). Learn more

Delete the email address

To do this:

1. Open Thunderbird.
2. Right-click on the email address to be deleted and select Settings.
3. Go to Account Management.
4. Select Delete account and click Delete
5. Refer to this other guide to correctly re-configure the email address

Delete contacts (in CardBook)

Now everything is integrated into Thunderbird, but if you still have an older version (which you must absolutely update):

1. Open Thunderbird.
2. From CardBook select the contact profile to delete.
3. Click on the menu button with three horizontal lines ☰ at the top left of the interface, then on Address Book and on Delete Address Book.
4. Confirm by clicking on OK.
5. Familiarize yourself with this other guide to reconfigure synchronization.

Delete the calendar / agenda (in Lightning)

Everything is now integrated into Thunderbird, but if you still have an older version (which you must absolutely update):

1. Open Thunderbird.
2. From Lightning select the calendar profile to delete.
3. Right-click on the calendar and select Unsubscribe from calendar.
4. Confirm by clicking on OK.
5. Familiarize yourself with this other guide to reconfigure synchronization.