Clutter moves your low priority messages out of your Inbox so you can easily scan for important messages. Clutter analyzes your email habits, and based on your past behavior, it determines the messages that you’re most likely to ignore. It then moves those messages to a folder called Clutter, where you can review them later.
Clutter Folder Location
The folder is located under your myMail inbox on the left-hand menu.
Issue: I would like to disable the clutter folder in my EKU myMail account
Cause: The clutter folder in your myMail account is a new mailbox management feature of Office 365. It can be turned on or off depending on your preferences. Clutter analyzes how you process your email and moves the 'unimportant stuff' out of your inbox folder and places that into the clutter folder. In theory it should leave you with an emptier and distraction-free inbox.