AS I peck I am on an old win 7.1 laptop left over from the office with network licenses
It nags to validate Windows o/s, but when you choose to go online, it cannot be updated without full w10.
So I live with the back black ground that no license forces, and the occasional nag note in the lower tray.
Another laptop died so that brought this one back to service. Ported in a SSD and it surfs just fine.
When I had reason to fire up MSOffice it is the 2010 version. Said I had 30 days to validate. I am past that now. Top of the app screen shows red, but so far the applications seem to be working just fine as far as manipulating data.
So this might be a work around to avoid the software as service model that expects you to pay all the time, whereas you once bought it one off.