Surely the wrong forum for your question.
However, it's quite clear you lost all messages that you received in your inbox (and didn't delete or move to other folders) after your last backup. As far as I understand your mail, your Sent Items and all other folders are still intact.
In the future, consider to include your mailboxes to your regular backup.
After booting my vista machine the other day, Chkdsk ran on startup, I opened outlook express too find all my emails had disappeared. I checked my outlook express .dbx files to discover that a new inbox.dbx file had been created.
I assumed that the old inbox.dbx had become corrupted, and checked the temporary "Found.001" directory that is created by chkdsk, there was only two files in this directory not related to outlook express.
I have tried to run two file recovery programs get data back and restorer xp, but cannot find the missing inbox.dbx file.
DO I have any chance of recovering this .dbx file or is it gone ?