We received from Microsoft the following message related to the use of macOS and Office 365 on 30 September 2019. Please read this message if you are using macOS and Office 365.
All staff and students using macOS are recommended to run one of the three most recent versions of macOS in order to receive the most up-to-date Office 365 features on Mac.
User Services Team
Tel: 3917 6220
If your organization is not using macOS then you can disregard this message.
As of the Office 365 for Mac November 2019 update, macOS 10.13.6 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 still work but you will no longer receive any updates including security updates.
To provide you with the best experience, Office for Mac supports Apple’s three most recent versions of macOS. With the upcoming release of macOS 10.15 Catalina, Office 365 for Mac and Office 2019 for Mac will support macOS 10.15, 10.14, and 10.13.
How does this affect me?
As part of the upcoming November 2019 update, existing Office 365 for Mac users on macOS 10.12 will not be offered any further updates. Upgrading the operating system to macOS 10.13.6 or later will allow Office updates to proceed. Additionally, new installs of Office 365 for Mac will also require macOS 10.13.6 or later.
Existing Office 365 users on macOS 10.10 or 10.11 will continue receiving Office security updates until October 2020 as they are using the older Office 2016 generation of apps.
What do I need to do to prepare for this change?
To continue receiving the most up-to-date Office 365 features on Mac, make sure all users are running one of the three most recent versions of macOS.
Learn more about Office 365 and macOS supportability see the Additional Information.