Comment 6 for bug 397980

Further Information:
    If you do the following:
    (1) Copy several emails into a subfolder of "Inbox"
    (2) Rename the folder
    (3) Chose File->Backup Settings
    (4) Restart Evolution

    At this point, the emails are still there. Now,

    (5) Chose File->Restore Settings and restore from
         the archive created in step (4)
    (6) Delete a single email from the renamed folder

Result:
    This will trigger the bug and delete all but the newest
    email from the folder.

Conclusion:
    Whatever triggers this behaviour gets saved with your
    backup archive! Bad! Very Bad!