Microsoft's cash cow
from TFA: "...what would become Microsoft's productivity cash cow..."
I respectfully submit that you have included an extra word in the phrase above.
"Productivity", in my experience, has very little to do with Microsoft Word.
Else, why would they change the UI every couple of years? Come to think of it, that applies to pretty much all their products, which seem to have reached "peak function" many years ago and are now being plastered with essentially useless "features" and "design changes" which add little but clutter to the UI.
Monday Microsoft rant over, please continue...