Your . . . calculations . . . are . . . wrong . . . Office is free...!
We bought Office 2003 ten years ago and have absolutely no intention of ***grading to a later version which offers nothing new. Buggering about with the user interface doesn't constitute a new feature.
As Paul Allen said years ago, the biggest competitor to Office is previous versions of Office.
Anyone who accepts this MS BS deserves every minute of their impending rogering.
***grading: which one is it? It's surely not an UPgrade, that implies some benefit on my part. Maybe it's a DOWNgrade (that poxy ribbon qualifies). Maybe it's a SIDEgrade, but that's just inventing a new word, a bit like Microsoft inventing a new benefit for them, licensing & delivery, and calling it a benefit for the punter. Maybe it's an MEHgrade.