[titanix2]

Windows 10 upgrade, no matter how Microsoft words it as an update, is actually a whole system replacement. So while most users trust Microsoft for keeping their system up-to-date, I don't think they approve its deletion and replacement by something else.

[Arizhel]

Then they misplaced their trust and should have picked a vendor they agree with more, because MS does think of it as an update. What "most users" think is irrelevant in court.