Inbox is the main view for the incoming messages. Each received message gets stored in your inbox.
After you receive the message double click on it to open.
To go back click Inbox section.
To forward the incoming message click back arrow.
You can filter all incoming messages by type: All, Received, Sync, Web Drops, Chats from the drop down menu on the header.
Search Here will allow you to search a word or phrase from all incoming messages.
To Delete the incoming message, mark the box to your left and then press delete button.
To move back and forward between different pages, push the arrows right/left from the header.