Windows Live Mail Subfolder disappears - so far, 6 times - message rules involved...

Windows 7Pro

Unknown version of WLM (I don't know how to find it)

POP3

Message rules

I monitor 4 different accounts.  Each of the accounts appear to be fine on their own (nothing amiss in those accounts).  To make my life simpler and to see all at the same time, I have a message rule which copies all messages to a subfolder in the main account (which for identification I call NullAllMail.  A wrinkle in WLM prevented me from having everything copied to the 'inbox' which came with that "account" being set up.  So, I created a subfolder called AllMail or something similar.  I don't actually directly remember as it disappeared after a while of perfect use.

That's been the story for what is now 6 times.  I raised this issue, complete with screen snips, and followed up several times in the past.

So far not a single response, whether from Microsoft or someone watching.

As, so far, all 4 individual accounts seem unharmed.  But because this contains material going back to the early 90s, imported from various upgrades in the past, with OE, I'm terrified that this may entirely disappear.  And, in fact, there HAVE been some degradations of some of the storage folders, as I save each account every six months.  One of them (maybe more; I haven't done a folder-by-folder inspection) has all but a half a month which has disappeared.  As I have repeatedly had to go back into these in order to fetch some data or information, to have this happen is catastrophic.  And trying to find something in a backup is beyond difficult, as to restore would overwrite whatever I currently have.

Back to the original, it has always happened as I have 'permanently delete'd items I don't need, such as a news feed mailing list, or a facebook notification, or whatever that I don't want to save.  That may have some clue?

Is there a trick to finding an entire folder?  I'm beyond frustrated; this is the name I've assigned to the current one, which I haven't yet populated (copying thousands of mails takes a great long while, never mind the error messages which makes it such that I have to do it in bits and pieces):  7thMofoGDammitAllMail .  That was preceded by 6th, 5th, etc., each with somewhat less blistering names than the successor.

Bleah.