I have just noticed something around the regular MS office updates. The patches are generally cumulative so supersede each other. The December patch 43108 was rated critical - so I had lots of highly vulnerable devices. Today patch 43165 was released, to supercede it, and this was unrated - meaning that suddenly all of my devices (as yet unpatched)  are all showing as healthy again . How does this make sense, as obviously the vulnerabilities are still there ?