There must be open source editors available that have feature parity with 12yo software.
Think how different the market becomes when consumers can keep using a 12 years old license. You need to introduce fantastic new features to get my money. Changing the font, the menu and the colors won't do.
Even if it is free - why should I bother to learn this new software? The old license did cost me $5. If I misplace it, I can buy another for the same amount instead of paying year to year. And to this day it works reliably on every operating system I use.
Dethroning MS Office is going to be a long, hard battle, and it seems like not very many people are interested in fighting it.