How can I recover a OE folder that was just deleted from my folder list for no reason? The folder was there one day and the next day it was gone. I have OE 6. Thanks, Tom Larkin

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There is a good chance you can recover them, but if you have a lot of folders in a tree-like structure, you will lose this structure, all the folders will appear under the main branch.
If this is OK for you, first you must locate the OE files - you must be able to see hidden folders for that, that's for starters.
Second thing is that you must positively identify the folder, especially if you have several OE Identities.
Once identified, I would make a backup copy of the whole folder (with OE closed of course), just in case. I know it can be big... :)
You will have various .dbx files there. If the dbx file for your lost folder is there, and has a substantial size, chances are that it's OK.
You should turn your interest to folders.dbx, which most often is responsible for such problems; it holds the whole folder structure, and sometimes gets corrupted.
The radical way is to delete it or rename to folders.dbx.old for example. Now start OE and it should re-create this file, but with all the folders coming from the main branch of the folder tree. If your lost folder re-appears and is intact, you can congratulate yourself and perhaps move the folders to reflect the structure they were in before.

I'm aware that I'm being a bit vague, but a person that doesn't know how to look for OE files, show hidden files, make a backup etc. etc. should not attempt to do it, as there's a risk of losing everything...

Good luck!