How to turn Clutter feature on / off for all users via PowerShell

First, connect to Office365 / Exchange via PowerShell.

http://iterrors.com/connect-to-office-365-using-windows-powershell/

To turn Clutter on:
Get-Mailbox | Set-Clutter -Enable $true

To turn Clutter off:
Get-Mailbox | Set-Clutter -Enable $false

To see if it worked, you can get the Clutter status by typing:
Get-Clutter -Identity info@iterrors.com