That letter isn't from microsoft though, I manage several tenants, and none of our end users or admin got that letter. specifically what is missing, is that em

That letter isn't from microsoft though, I manage several tenants, and none of our end users or admin got that letter. specifically what is missing, is that email using basic auth won't disconnected OCT 1st because of the tons and tons of machine that do things like email faxes, and scans that do not support modern authentication. This looks like whoever "enterprise services" is, they wrote a brief message that wasn't very accurate.