If you want to start using the new Clutter feature in Office 365 you’ll need to enable it. To do that firstly login to your Office 365 web portal and go to Outlook.
Then select the COG in the top right of the windows. From the menu that is displayed select Options.
Then under the Automatic processing option select Clutter. On the right select the option to Separate items.
You should now see a new folder in your Outlook called Clutter as shown above.
Once it has been enabled you’ll need to let Clutter do its work, it will take a little while for emails to automatically be moved into the Clutter folder. Remember, you can always drag email in or out of your Clutter folder and the system will learn based on these.