Mark Messages Read or Unread

1. Select an item in your Inbox.
2. Select Edit > Mark as Read or Mark as Unread or Mark All as Read from the main menu.
 
Change Options for Read and Unread Messages
1. Select Tools > Options from the main menu.
 
2. Select the Other tab.
3. Click the Reading Pane button.
 
4. Adjust the Read vs Unread options as needed.
 
5. Click OK to close all remaining windows.