Email backups

When I installed my new 2Tb WD Passport it showed that emails took up a certain amount of memory and it seemed to copy them.

But when I manually search the passport I can find all my other data files but no emails.

How do I find them?

I am using Windows 7 and Thunderbird.

The Email extension is not visible unless you use the program that decodes this file type.

The files will be visible when restored and opened with Outlook or the email application you used.