Hundreds of blank emails in local folder after moving emails from server. Repair folder does not help

It sounds like your mail files are corrupted. Try to rebuild the index file of the troubled folder. Right-click the folder - Properties - Repair Folder Note: depending on the corruption this may erase messages from the affected folder which cannot be recovered anymore. In that case you'd need to restore them from a recent backup. Corruption is often caused by anti-virus software messing with Thunderbird mail files. It is therefore recommended to create an exception for the Thunderbird profile folder, so that the real-time scanner won't attempt to scan the profile with your mail. For more information on the profile location see http://kb.mozillazine.org/Profile_folder_-_Thunderbird