
Step 2 From the Thunderbird menu, select 'File', search the 'Offline' button, and then click 'Work Offline'. This is to prevent any conflicts in the process of repairing. Step 1 Turn off automatic mail checking as a precaution. There are few steps provided to repair folders in Mozilla Thunderbird especially to recapture back all missing emails or deleted messages that keep repeating: Sometimes, the folders in Mozilla Thunderbird may face difficult problems when running, in which, messages that usually appear are not shown, or deleted messages are still present. Method 1: Repair Folders in Mozilla Thunderbird

