You can no longer turn off or disable windows defender

Then, still, saying that Windows Security is "crashing Outlook like mad now" is a gross overstatement.

This is another of those issues, like so many, that is affecting a small number of users among the absolutely massive embedded base. And when you've got untold millions of users, "a small number" of the base can be quite a few people, but still a tiny portion of the user base.

I've often said that most issues, not just this one, are idiosyncratic to a machine or a set of circumstances, not global. That doesn't make them any less traumatic by those affected by them, but it doesn't make it a widespread problem when one takes the existing users as a whole into account.
 
@Galdorf

I have an even simpler explanation then...

I have zero Outlook 2016's installed, everyone is running Outlook M365, which is Outlook 2019. 2016 and 2019 are very similar right now, but they aren't quite the same.

And yes, huge calandars and such are common.
 
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