A restore of HIERARCH.PM from backup normally works when the backup is recent enough. The fact that it didn't indicates that either it was too old or the damage has already been done when it was backed up. There isn't another way to recover trays.
I wonder if whatever affected HIERARCH.PM also affected PMAIL.INI resulting in the "Deleted messages folder persists between sessions" option being set to the default of disabled.
Losing tray structure is not fun. A hint I offered to all of my co-workers was to use some sort of code as a prefix to each tray name and use that code as a prefix in the folder name of each folder in the tray. That way, if tray structure was ever lost, the sort of the resulting folder would have each trays folders grouped together. Figuring out the tray name of each grouping remained a challenge though. We did nightly backups so this recommendation was a backup to the backups.
A restore of HIERARCH.PM from backup normally works when the backup is recent enough. The fact that it didn't indicates that either it was too old or the damage has already been done when it was backed up. There isn't another way to recover trays.
I wonder if whatever affected HIERARCH.PM also affected PMAIL.INI resulting in the "Deleted messages folder persists between sessions" option being set to the default of disabled.
Losing tray structure is not fun. A hint I offered to all of my co-workers was to use some sort of code as a prefix to each tray name and use that code as a prefix in the folder name of each folder in the tray. That way, if tray structure was ever lost, the sort of the resulting folder would have each trays folders grouped together. Figuring out the tray name of each grouping remained a challenge though. We did nightly backups so this recommendation was a backup to the backups.