In it, Wilcox set out the official patching principles:
Microsoft’s adherence to those principles is the subject of ongoing, heated debate, of course.
Permit me to strip away the bafflegab and explain how Windows (and Office) patching really works – from the customer's point of view.
Microsoft’s patching cycles revolve around Tuesdays.
For the past couple of years, Microsoft has been trying to recast the Gregorian calendar in some sort of “A week” / “B week” nonsense, but if you just look at Tuesdays, you’ll start off on the right foot.
These combined security and non-security patches are “cumulative” in the sense that, if you install one of them, you’re caught up on all of your patching obligations for that particular version of Win10.