Lots of "accidentals" for such a large company
That Windows 10 upgrade? It "accidentally" downloads to your computer even if you didn't reserve a copy.
Installing that Windows 10 upgrade? It "accidentally" was checked off to install that update this time.
[a week later]
Next year, that Windows 10 upgrade will not "accidentally" be checked off to install that update.
Your default apps? Those were "accidentally" changed to Microsoft's apps in Windows 10 when you updated the OS.
Your privacy settings? Those were "accidentally" forgotten and reset when you updated the OS.
There's a whole lot of "accidental" mistakes being made by a company that isn't "accidentally" large who doesn't "accidentally" have millions of Insiders doing their beta testing for them.