Ah, let me tell you a tale of woe when it comes to AutoDesk changing their products and plans.
I personally bought an R11 license for use at home and then paid again to upgrade it to R12 for Windows.
It was supposed to be upgradable into the future as well.
So far so good?
Then it wouldn't work with the OS I upgraded to.
Then it would no longer work with the AMD K6 Athlon CPU I had.
Then it decided it didn't like my (rather expensive) graphics card.
Finally it stopped working completely.
And guess what happened when I then attempted to upgrade my bought and paid for AutoCAD license (which included AME3D) to a version that would be compatible with current .dwg files and my hardware (so I could work at home sometimes).
"Sorry, your license is too old, you must buy a new full price one from scratch".
They lost me as a private customer there and then.
Thank God for DraftSight and other similar programs that are available now.
Funny that they don't seem to care what revision a .dwg file is.
But even more recently AutoDesk has moved toward "subscription" or annual contract only plans rather than outright purchases.
So I'm not so sure that I would trust them with an outright purchase even if at a reduced price.
I only use their products through work now.
I will use anything else at home unless I happen to have my work laptop handy.
Inventor is still nice to use.
Rant complete, does not compute, pop stack, reset....
P.S. I use an older, also bought and paid for, version of Office at home as well as OpenOffice and LibreOffice.
Neither of them have any notable issues with .doc, .txt or .ppt (including the x extension) files.
$100 a year to use MSOffice? Not a chance.