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.

Microsoft 365 is a collection of powerful office apps and services that are available on Windows, but they aren’t limited to just Windows users. Mac, iPhone and iPads can also get in on the fun ...

Office 365 Pro Plus (Microsoft 365 Apps) on Windows 8.1 will be supported until January 2023. Office 365 ProPlus (Microsoft 365 Apps) on Windows Server 2016 will be supported until October 2025.