Office 365 Clutter
What is Clutter?
Clutter is a new feature from Microsoft that helps filter low-priority email, saving time for your most important messages. Clutter looks at what you've done in the past to determine the messages you're most likely to ignore. It then puts them here, in the Clutter folder. Just keep using email as usual and Clutter will learn which messages aren't important to you. From time to time, Clutter might get it wrong. You can move the messages incorrectly identified as clutter to your inbox, and Clutter will take notice. And if you find Clutter isn't for you, you can turn it off any time.

To move messages from Clutter to Inbox:

Drag the message from Clutter, and drop it into Inbox.

To disable Clutter folder:

  1. From the top-right corner, click on the gear icon and click on “Options.”
  2. On the left side, click on “Mail” then click on “Clutter.”
  3. Uncheck “Separate items identified as clutter” and click “Save.”
For screenshots of the above steps, click here.