After Outlook Express 6 asked me to compact my mail folders, I found that more than 6 months of mails has disappeared. (They are not in the deleted folder.) Where would it have gone, and how can I fix this problem?
Got this problem solved. Had a look in the Recycle Bin, and found the Inbox.bak file that Outlook Express apparently makes sometimes before it does a compact. Moved it to Outlook Express' store folder, renamed it do Inbox.dbx, overriding original. After starting Outlook Express again all was well.
See here for instructions on how to find your store folder.