As new major versions of macOS are made generally available, Microsoft will drop support for the oldest version and support the newest and previous two versions of macOS.
What's the difference between Microsoft 365 and Office 2019? System Requirements
Office 2019 is sold as a one-time purchase, which means you pay a single, up-front cost to get Office apps for one computer. Microsoft Office helps you complete common business tasks, including word processing, email, presentations, data management and analysis, and more.
