How Do I Restore Missing Email Folders in Mozilla Thunderbird?
To retrieve information that has gone missing in Mozilla Thunderbird, use the **Repair Folder** in the **Folder Properties** to reload all your email information from the original mail server such as Yahoo, Hotmail or Gmail.
Open Thunderbird and click the **Inbox** that belongs to the email address for which you want to restore a mail folder.
Choose **Folder Properties** from the drop-down list by clicking **Edit.**
Click **Repair Folder** under **General Information** in the **Folder Properties** window to re-synchronize the folder with the server.
Thunderbird retrieves your emails from the server. You can find your emails after the download is complete.