Each account has a random-access file called the Folder Index, which maps messages to categories. This file could get corrupted, for example, if you turn off the computer while an operation is in progress. The Check function, under Repair, verifies the integrity of this file.
The program keeps a transaction log, which is a sequential list of changes to the Folder Index. The Repair function creates a new Folder Index by replaying the transaction log and then copying messages and folder links to a new file. Use this if messages are missing or you get exceptions.
There is no way to delete an account from within the program. If you want to delete an account, use your operating system to remove the corresponding directory. There is no way to recover a deleted account unless you have kept a backup.
If you used the Windows installer, click on the icon to start the program. If you downloaded the portable executable, click on [confidantmail.exe]. If you are running from source, the program is normally started with the command:
$ pythonw config_chooser.py
$ python config_chooser.py
To select a different home directory, run:
$ python config_chooser.py -homedir /homedir-path
To open an account directly without the chooser, run:
$ pythonw gui.py -homedir /path-to-account