"NOW he tells me." Wish't I were as adept as you in protecting myself. I shall proactively search Windows forums for Paul M999 posts in the future.
I take some comfort that I dodged Windows 8 and paid a substantial premium to get Win 7 machines. And, I'm glad I've resisted the enticements for Win 10.
How embarrassing it must be for MS to need multiple updates to fully resolve a problem MS created that affects only MS' own e-mail platforms (and their latest and greatest operating system).