dbx folders missing in Outlook Express

An XP Pro Workstation hadd all of its Store Folders *.dbx Folders in Outlook Express replaced with empty default folders. Recreating the Folder.dbx file did not reaccess the folders and Easy Outlook Express Repair, Advanced Outlook Express Repair, and Toolbox for Outlook Express also have had no effect.

Any suggestion as to cause, how to prevent, and or how to restore the folders? The dbx files appear to actually exist in the Outlook Express Folder under Documents and Settings.