Hello there bob. We have read your message. We try to help you. Your content pane does not update. Did you try to update manually ? The Thunderbird software itself? Does your inbox pane stays blank or grey? https://support.mozilla.org/en-US/kb/uninstall-thunderbird Installing the new fresh version of Thunderbird it automatically overwrites the old update. https://www.thunderbird.net/en-US/thunderbird/all/ If you do not want to install the new version try to right click the folder and select properties and then the repair button to re-index your mail. That seems to repair your folder. There are other option s if this not work. To delete the msf.files for the inbox. The map is on your ssd and try to turn out your Thunderbird software before deleting. It requires a restart after deleting this files on your Apple machine. It automatically repair itself. You can take backups if it s important to you. Greetings Firefox volunteer.