Office 365 Clutter service is a service that helps clean up user inboxes by moving e-mails deemed as ‘low priority’ into a Clutter folder in Outlook.  Clutter leverages machine learning, in addition to usage, and “learns” what users consider important or not.
This week Microsoft announced new improvements that promise to make Clutter even better.  If you use Office 365 and Exchange Online follow this link and learn more about the changes introduced this week.