On the message list, you can now mark a message as unread.
For messages sent to you (i.e. messages that you have permissions to change its status to ‘Read’ if you were to open and read it), you are now able to revert a ‘read’ message back to being ‘unread’.
To use this option, navigate to the Messages tab and locate the message you wish to mark as ‘unread’. Click on the message and if you have already read it, you will be given the option to click ‘Mark Unread’.
Once you have marked the message as unread, you will see that the message’s icon will change back to the blue ‘new message’ icon, as shown below: