Microsoft's Clutter feature in Office 365 is a "second-tier" Inbox folder containing emails that Office 365 moves there based on your email habits, and based on your past behavior.

Help Clutter Learn Your Preferences Faster

Clutter takes time to adapt to your preferences as it records your choices and uses that information to identify similar messages in the future. You can help Clutter learn your choices faster by doing the following:

• If you see a message that identifed as Clutter by mistake, move it from the Clutter folder to your Inbox.
• If you see a low priority email in your Inbox, move it to the Clutter folder.

Microsoft filters Clutter, like junk email, before it reaches your Inbox. After any messages labeled as junk are sent to the Junk Email folder, Clutter analyzes any remaining messages and filters out email that you have typically ignored or not responded.

Note: If you are missing emails, look in the "Clutter" folder similar to the "Junk Email" folder.

Turn Clutter Off

You can turn Clutter off anytime in Outlook Web client. By default, Microsoft turns on the Clutter feature.

1. After logging into the Web client, go to "Settings"
2. Under "Your app settings," click on "Mail."
3. Under the "Mail" heading in the Options panel, click "Automatic processing" if the menu is not expanded
4. In the expanded "Automatic processing" menu, click "Cutter."
5. Select the "Separate items identified as clutter" checkbox to deactivate, and then click "Save."
   

Note: The Clutter folder remains in Outlook after you turn off Clutter feature.

Turn Clutter On

1. After logging into the Web client, go to "Settings"
2. Under "Your app settings," click on "Mail."
3. Under the "Mail" heading in the Options panel, click "Automatic processing" if the menu is not expanded
4. In the expanded "Automatic processing" menu, click "Cutter."
5. Select "Separate items identified as clutter." checkbox to activate, and then click "Save"

Note: You can also have Microsoft notify you about any emails moved into the Clutter folder by selecting the checkbox for "Send me notifications about messages that are separated as clutter."