Many post your plea and ... the View was not set to ALL.
Last week, within an hour of using it, all the contents of my Inbox vanished, taking everything from March 2005 on. In addition, all the subfolders I had created vanished completely, too. The contents of Sent Mail, Deleted Mail and the Zone Alarm-challenged mail remained.
Where the heck did all that stuff go? There's mail I really need to use. I know there's got to be a place where it's stored, but I can't find it. (When I looked into the OE folder, the contents stopped at March 15.) There's no new programs or updates for that time. I tried to use System Restore, but learned the hard way that the store techs apparently disabled it when they installed everything on this computer when I bought it (including the OE folder from the old computer).
I use OE6, Windows XP home, Zone Alarm Security Suite on an HP Pavillion a810n.