With DriveHQ EmailManager, backup and restore emails is simple and straight forward. It depends on how you backed up your emails. If you created a backup task before, then you can install DriveHQ EmailManager on your new PC, then logon and click on Restore button.
If you manually backed up your emails using drag-and-drop, then you can manually drag and drop emails back from DriveHQ Webmail to your local Outlook / Outlook Express.