365 Office Sierra 10.12. 60

If you're running Mac OS X version 10.10 or later, follow these steps to set up an Exchange email account: Open Mail, and then do one of the following: If you've never used Mail to set up an email account, the Welcome to Mail page opens. If you've used Mail to create email accounts, select Mail Add Account. Problem is the OS is one or two versions too old for Office 2019. But it looks like I. Edit: Updated the OS from 10.12.4, Sierra, to 10.13.0, High Sierra, and Office magically turned into Cinderella - Office 2019, Volume License 2019. Even though the MS download page said the Office 2016 was a suite with a perpetual, VL, license. Activate MS Office 2019/2016 for macOS - MicrosoftOffice2019VLSerializer Office 2019 above. Note that Office2019 DO NOT support activate via simple copy/paste plist license file which is the simplest way to activate Office 2016.

The drop will come as Apple releases macOS 11 Big Sur.

What you need to know

Office 365 for Mac apps are set to drop support for macOS High Sierra next month.
Support will officially end on November 10.
This keeps with Microsoft's practice of supporting the latest three macOS updates.

As we approach the release of macOS 11 Big Sur, Microsoft is preparing to shift its Office 365 support away from another older version of macOS. Specifically, Office 365 apps will no longer support macOS 10.13 High Sierra as of November 10. From that point, only macOS 10.14, 10.15, and 11 will be supported with the Office 365 suite.

In an update to the Office 365 message center (via OnMSFT), Microsoft said:

As of the Microsoft 365 for Mac November 2020 update, macOS 10.14 Mojave or later is required to receive updates to Word, Excel, PowerPoint, Outlook and OneNote. If you continue with an older version of macOS, your Office apps will continue to work but you will no longer receive any updates including security updates.

This move stays in line with Microsoft's practice of supporting the latest three macOS releases with its Office 365 suite. Currently, those include macOS 10.13, 10.14, and 10.15. After the release of macOS 11 Big Sur, the oldest version supported will be 10.14.

365 Office Sierra 10.12. 60

As of the release of Big Sur, macOS will support both Intel and ARM-based Macs. Apple is expected to launch Macs sporting its own ARM-based chips later in 2020, and the company says Microsoft's Office apps are already running on ARM-based Macs.