Hello there terry83 We have read your message We try to help you. Oké what does the complete error says? Send me a picture of the complete error. From your computer platform that gives this message . Make a backup from your stuff and hopefully it reinstalls your maps after. It won t affect your maps on the pc it self. You can download the version Thunderbird 91.01. via the link I posted below. The profile folder that stores your personal data is stored elsewhere, so you won't lose bookmarks and extensions. https://support.mozilla.org/en-US/kb/profiles-where-thunderbird-stores-user-data#w_backing-up-a-profile https://www.thunderbird.net/en-US/thunderbird/91.0.1/releasenotes/ Greetings Firefox volunteer