Pauline is concerned that with Verizon buying AOL, her Yahoo Mail will go away. How can she back it up? Leo says that using POP3 mail is essentially backing up her email to her hard drive because it downloads the email directly to her computer. So it's already backed up.
Another option is using IMAP instead and then use the option to cache it locally. There's also a great free email client called Thunderbird by Mozilla. It will store her mail in a text based mail format that she can then backup after the email is backed up. When she sets it up, she should select to download everything and Thunderbird will not only download the email, it will also download the file structure with all the folders and categories as well.