Email: If you had purchased and downloaded the Microsoft Office from an online store via
office.com/setup, search your email folder as it is possible to get the product key from the email receipt.
Sticker: In some cases, the Office program is stored in the computer. If this is the case, the product key will be found on the Certificate of Authenticity of the computer. If you cannot find the printed sticker, search for it on the box, CD or packaging of the computer.