Thomas, sorry to be so long getting back to this. I've been out of commission for a bit.
I've got some questions regarding the procedure you set out.
Step 1. My Home Mailbox is shown as C:/PMAIL/MAIL/kwb
Step 2. I found three HIERARCH.PM files.
The first is located C:/PMAIL/MAIL/HIERARCH.pm (size=28.5 Kb)
The second: C:/PMAIL/MAIL/JOAN/HIERARCH.pm (size=6.03 Kb)
The third: C:/PMAIL/MAIL/KWB/HIERARCH.pm (size=26.6 Kb
Which of those three do I want to rename? My guess would be the first (size 28.5Kb).
Step 3. Running WinPMail will re-create whichever I renamed. Will it in any way disturb the others? Will all my stored email be safe? There are some emails which I cannot afford to destroy.
I have my system backed up, and will do an incremental backup before the above process, but it would be so much easier not to have to re-build my system.
Thanks for your help and attention.