Yes, old DBX files from a hard drive backup can be converted if the files are still readable. The first step is simple: copy the DBX files to a new folder and do not edit the original backup. This keeps the source data safe if something goes wrong.
You may see files like Inbox.dbx, Sent Items.dbx, Drafts.dbx or custom folder names. These files can still hold old Outlook Express emails even when the original email account is gone. The main problem is that Outlook cannot open DBX files like PST files.
For this backup recovery case, GainTools DBX to PST Converter Software works well as a DBX to Outlook PST bridge. It lets users browse the required DBX file, preview available emails, and export the data into PST format for Outlook access. The converted file can be saved locally, so the old backup remains untouched.
Try the free demo with one DBX folder first and check dates, folders, and attachments before full recovery.