Views give you a glimpse of all messages (new, assigned & resolved) in the Inbox. 

How to use Views:

Click on the name of the view (by default - “Assigned to me” tab) which is accessible on the top left of the screen, on the left-hand pane.

A drop-down list of all pre-defined Views will appear.

Note: In case you are not a member of the Group to which the message has been mapped, you would not be able to pick it up.