generally display issues, which is what I read you as having are caused by things like antivirus programs and choices like placing the profile folders in non standard locations which are subject to streaming backups or cloud synchronization, or even locations that are not physically internal to the device.

In most cases right clicking the folder, selection properties and then the repair button to re-index the store will fix those display issues.

The repair button restored the garbled message and the blank one. Thank you. It might be faster if you could select the messages to repair or repair only those that display after a filter is applied to the messages.

The repair button restored the garbled message and the blank one. Thank you. It might be faster if you could select the messages to repair or repair only those that display after a filter is applied to the messages.

The mail folder consists of two files, a mail storage file which could be many gigabytes in size. The second file is essentially an index which contains the information Thunderbird shows in the lists on the screen, and a pointer to where the data is stored in the mail file for when you actually select that email to read.

Repair rebuilds this index. It is not actually repairing any data as such, despite the name. It is also why the process is slow as the entire file needs to be read to build the index.