Unfortunately for macOS users who are still clinging onto older builds of the operating system, it seems that if you want to keep accessing Microsoft’s Office 365’s latest updates and features, you will need upgrade your operating system to High Sierra or later. This was announced on Microsoft’s Office website in which they are making it a requirement starting next month that Office 365 will only work on macOS 10.12 or later.
However if for whatever reason you choose not to upgrade, maybe your current Mac doesn’t support the newer operating systems, not to worry because it does not mean that Office 365 will stop working. According to Microsoft, “Users who do not update to macOS 10.12 or later before the September update will still receive mainstream support and will be able to continue using their current version of Office 365 for Mac.”
Basically for those who don’t update to High Sierra, you guys won’t be able to receive new feature updates which is kind of the whole point of subscribing to Office 365 in the first place, but the Office apps installed will continue to work without any issues.