@britechguy You should care when mainstream ends... because there have been several cases where a security update breaks a feature on a Microsoft something or other, and there is no fix. You're just stuck without that feature, because you only get security updates in extended...
Also, there have been a TON of spear phishing campaigns in the last three years that specifically target Word and Excel. That's how many cryptos get around. So yes, those need patched too lest a user double click on the wrong file and BOOM. The vulnerabilities aren't just in Outlook anymore.
A) I never said that the vulnerabilities are only in Outlook. I did say that the shields for the vulnerabilities that appear, that do not rely on social engineering, have become myriad. Phishing relies on human action, and there is nothing but vigilance on the part of humans that can or will stop it.
Users Themselves Are The Most Substantial Weakness In The Security Chain
B) In the decades I have been using Office (and I'm almost 60, and started in the IT world in the mid-1980s) I have never had feature break (or at least one that I use, but truly, I've never even seen one break for someone else).
Most people do not use the vast majority of the features of any one of the Office Suite Programs. If a critical feature that you use breaks, you update, it's that simple.
If it doesn't break, and you're still getting security patches, those are for the things that the end user cannot protect against.
I don't believe, and never have or will, in worrying about the remotely possible, but the reasonably probable. I also can't and won't worry about attack vectors that rely on the end user to take action for the attack to be successful. The only thing that can be done about those is user education, and I'm not sanguine, after all of these decades, that it's done much because people seem to want to believe, "It could never happen to me," which is the most certain way to increase the probability that it will. You have to apply some critical thinking skills before clicking, opening, etc.