Browser: The current version of Safari, Chrome or Firefox.For the best experience, use the latest version of any operating system. When a new version of MacOS is released, the Office 2019 for Mac Operating System requirement becomes the then-current three most recent versions: the new version of MacOS and the previous versions. Operating system: Office 2019 for Mac is supported on the three most recent versions of MacOS.Display: 1280 x 800 or higher resolution monitor.HFS+ hard disk format (also known as macOS Extended or APFS)