Microsoft will also send you a copy of the product key in a confirmation email.Microsoft Office 2016 product key: the latest version of Microsoft Office 2016 was introduced with the permanent Feature. The product key will be revealed, copy the product key If you bought Windows 10 through the Microsoft Store: When you purchase your Windows 10 license from the Microsoft Store, a copy of the product key is stored in your Microsoft Account. They are genuine Microsoft product keys they are actually retail licenses, but it is intended for a particular product channel – either the Microsoft.