This feature will be beneficial for you if you have a lot of emails coming your way and if you would like to handle them in a more efficient manner. Just select an email in your Apple mail and drag it into the appropriate quadrant in Priority Matrix. The body of the email will show up under the Notes section and if that email had any attachments you will see them under the Files section. The coolest thing is that if you double click on the item, it will open the original email in your Apple mail.