Microsoft has started to activate Clutter for Office 365 customers. Clutter is designed to help clean up the inbox automatically and distinguish important from unimportant emails. Clutter works in a similar way to some spam filters; emails have to be moved to a folder so that Clutter can "learn". There is an article about this on the Office blog:
http://blogs.office.com/2014/11/11/de-clutter-inbox-office-365/
Clutter is currently only available for Office 365, let's see if it also finds its way into Exchange 2013 on-premise.
