Follow these steps to view the messages in a mail file using the Header window controls:
If the desired mail file is not already on the Load menu, choose the desired mail file from the Mail File menu.
Alternatively, you can type the name of the mail file in the Mail File text field.
Choose the mail file from the Load menu on the Mail Tool Header window.
If the desired mail file is listed in the Mail File text field, you can just click SELECT on the Load button.