Jan 3, 2017 For details about your Mac model, click the Apple icon at the top left of your screen, These Mac models are compatible with macOS Sierra. Mar 27, 2017 This update is recommended for all macOS Sierra users. Mar 27, 2017 Check About This Mac to find the version number and build number of your Mac operating system. Knowing the macOS version number can.
MacOS brings Siri to Mac. Along with new ways to enjoy your photos, shop more securely online, and work more seamlessly between devices.