Folks, I don't know if Microsoft has changed their algorithms or what, but our entire user base has been seeing really important emails getting dropped into the folder within the last week. Just more or less a heads up to anyone that hasn't noted it yet.
Dear Microsoft, if we really wanted another Inbox, we would have said so. Intent was good, execution sucks!
I have disabled it domain-wide now by sending this powershell command:
"Get-Mailbox | Set-Clutter -Enable $false"