I came up with that number because YOU said it. She paid $40 for Windows 8, and then got free Windows 10. Also, MS already doesn't make money every year on OS upgrades. They make money on PC builders paying for each license and on companies paying for them. MS doesn't care about users buying their OS. It is such a small market they aren't losing any real income.
You don't have a key that predates this model for OEM copies of Windows. It has been that way for a long time (XP at least). An OEM copy of Windows 7 should not activate on a new MB or CPU combination than the one it was originally activated on. However, this generally isn't an issue because you just use the help or call MS and tell them you had to replace faulty hardware and acknowledge that copy of Windows is only activated on one machine and are good to go.
Yes, I said because MS didn't charge full price for W8, and gave W10 for free, they lost money. You just totally interpreted that statement into something different. What, I'm not entirely sure. I also didn't say they make money annually, I said they lost the year of upgrade revenue for W10's first year of release. Again, you're twisting my words into something completely different than what they are.
Also, I'll just go ahead and disagree with you about the Windows key activation. I used the same copy of my OS from my AMD Phenom II build to my Haswell one. I didn't need a new key. I didn't have to get MS to help me out. I just threw in the disc and went to it.
But we're 18 miles off-topic. Not going to bother with the discussion further, so have whatever say you wish, and let's move on.
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