Hello and thanks for your patience.
Try this function to access your archived Mail.
From the Mail menu bar,
•Select File>Import Mailboxes
• When you click Continue
a small Finder window will popup
• With your external hard drive connected, locate the folder which contains your
archived Mailboxes for the D-B Mail account from that external drive.
• What you will be looking for are the .mbox
files for this account.
• Once you locate them on the external drive, select one of them
and click the Choose
• This will import the selected .mbox folder right into your Mac OS X Mail application and the messages within that folder should be available.
That is all it should take.
Now if you have done this already, or you run into any issues with these steps, just reply back to this post and let me know. I will respond back as soon as I can, to continue troubleshooting this issue for you.
Thanks again for allowing me to assist you and I hope this process helps resolve the restoring of your archived Mail issue for you.