To prepare old Outlook Express DBX emails as a PST archive for audit checking, first keep a separate backup of the DBX files and work only on the copied folder. Outlook cannot read DBX files directly, so the emails need to be converted into PST format before review. If an old Outlook Express setup is still functioning, you can attempt the manual export method; however, this approach is impractical for most old backups. On Windows, this trusted tool GainTools DBX to PST Converter, can be tested because it lets you check DBX data before saving and create a PST file for Outlook. Thereafter, open the PST in Outlook and verify sender details, dates, folders, and attachments before giving it for audit checking.