As everyone can verify, Office 2019 is just a snapshot of Office 365. Office 365 is a moving target, it gets updated all the time. Office 2019 is just a snapshot that was taken this summer, officially shipped on September 24.

You would expect the system requirements for installing Office 2019 to be equivalent to those of Office 365, given that those are basically more or less the same exact binaries with same dependencies.

And yet, here are the system requirements for Office 365 wrt the operating system :

Windows 10, Windows 8.1, Windows 7 Service Pack 1, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012, or Windows Server 2008 R2

And here are the system requirements for Office 2019 :

Windows 10, Windows Server 2019


So a slight discrepancy between the two. How come you can't install Office 2019 unless you are running Windows 10 but you can install Office 365 with just Windows 7 ?

The answer is plain obvious. Total shameless Microsoft. Microsoft ships Office 2019 because they have to, otherwise corporations out there would sue them for forcing the purchase of software subscriptions, because that's the commercial reason for Office 365, there is no technical reason for Office 365 to exist at all otherwise. But Microsoft makes sure you will never want to purchase Office 2019. So that's just lipstick on a pig. This corporation cannot be trusted. Move on guys!