For you mail, what you could do...

First, check to see if in Netscape Mail, in the File menu, there is a Save As... command. This will allow you to save your emails into a text file or some other format. If such a command does not exist (and God help you if it really doesn't), you can copy and paste each email to Notepad.

The end justifies the means...but the latter is tedious as heck.