The issue here is of course, two things. First, it's set to simply delete anything that is suspected of being spam. The second is that it's set to identify anything that was NOT put on the safe sender list as spam. Emails from senders they'd never set as a safe sender would be simply deleted before they ever saw them. Neither of these clients were likely to have made this setting change themselves, so I don't know what may have done it other than a Microsoft Patch, but I haven't looked into it.