Calvin is frustrated that he can't back up his email on Outlook.com. He wants to be able to have his mail online and on his computer. Leo says that Microsoft wants users to use the new Microsoft accounts. He can set up his Outlook.com account using the IMAP server, which is in configuration settings. He won't want to select PoP mail, though.
Pete wants to get his email downloaded off of Yahoo since he heard they're selling off their email. There are backup strategies, including a "backup my email" option from Yahoo. Thunderbird is a good email program to download, and he can get his email downloaded that way as well. He'll just need to turn on POP email. When he uses POP mail, it will download the email from the server and store it locally.
In the early days of email, the internet service provider didn't want to be storing emails on their servers. They wanted you to log on, get your email, and then they would delete it. This is what Carlos is currently doing with Outlook. He's getting on the server, downloading the email, and deleting it from the server. It's an email protocol called POP. Carlos can continue to use POP if he wants, but in Outlook's settings he should change it to not delete the email from the server. That will leave the email on the server. This isn't the best way to do this, however.
Diane wants to be able to save her email messages from Yahoo Mail locally to her computer as a form of backup. Leo suggests using an email client, and he recommends Mozilla Thunderbird. This program stores email in a very standard mbx, or mailbox format, that other programs can also understand. That way, if Thunderbird were to go away, Diane would be able to easily be able to still look at her messages with any text reader.