Finally Microsoft office 365 is compatible with Mac OS X 10.10. Microsoft account required. So this is the first time that Microsoft allowed his any app on Mac OS also.
Don’t worry it will support all your Mojave features it’s confirmed by Apple also it’s designed specially to support all features.
How to Install or buy ?
The best thing you have to just open your App there you can install it and if you want to purchase Microsoft Office 365 then there is a purchase option with in app.
What is Office 365?
Office 365 is cloud based subscription services by combining best-in-class apps like Excel and Outlook with powerful cloud services like OneDrive and Microsoft Teams by it you can create or share anything on any devices.