Microsoft Office suite is not only available for Windows operating device but also Mac OS. For downloading and installing MS Office Setup on Mac, you have to browse office.com/setup Mac. If you visit this site first time, then create a new Microsoft Account first with active email address and authentic password. Thereafter, you are suggested to sign in MS Office Setup account and search for the product key. After providing the 25-digit security product key, you can Activate, Install, Setup, and Download MS Office 365 on Mac.