Mike wants to know how to tell a real email from a phishing email. Leo says to hover over any link that would send him to a website, and see if the link is legitimate. He should never click on it. If it says to install something, or even asks for a credit card, don't do it. That's usually the first sign of an intent to do something nefarious.
Mike's wife is also getting a notice that her Windows 7 installation isn't genuine and it's been really slow. Leo says that indicates that an unlicensed version of Windows has been installed. They should contact Microsoft and they'll check. If it isn't legit, they can pay to make it so. But if they're going to do that, they should get Windows 10 instead.