Office.com/setup is one of the most important parts of the Microsoft Office software. This is really a great part of Microsoft Office. This is an integral software part that makes it secure and your product is your safety. office.com/setup, a website or we can call it a Microsite. This is really amazing and a secure microsite that lets you secure your office subscription or purchased products. This is not something that you use everyday but this website does a job of letting you verify your product and install it on your device. This website is required when you have to verify your product key. You will need to install Office on your device within this website. This website lets you install Office with your 25 Alphanumeric Product key. The 25 digit Alphanumeric product key is a product key that is available in your email, if you have purchased online or if you have purchased from a store you can see it on the back side of the product card. WHAT IS A PRODUCT KEY? A product key