I want to back up my email (not the program but the actual emails) and do not know what files that I should try to back up or where they may be located.
I am using WIN Mail on Vista OS.
Can you help me? Thanks, Bob

You can use the built-in function for that:
How to backup your data | Windows Vista for Beginners (http://www.vista4beginners.com/How-to-backup-your-data)