I'm still hopping over Microsoft ending support and registration for Office 2011; I have two copies boxed with licences but they can no longer be activated. Microsoft no longer supports them and has no interest in that version, but they won't allow already purchased copies to be activated if, for example, a software update loses the original activation. I queried it - a lot - that I have spent money on two boxed programmes that were at the time quite expensive, and they have arbitrarily refused me to activate them despite the fact that it would result in no loss of revenue to Microsoft as I'm not buying a later version. The reply was: "Sorry we can't help you, bye!"
I'm now using Libre Office instead, it's free and seems to work very well.