While you're in Chat view, the List pane displays all the recent chats you've had. This lets you easily manage multiple chats at once and return to a recent chat quickly.
Whenever someone sends you a message, a pop-up notification will appear on-screen. This will include who the message is from, a short preview of the message, and the option to quickly reply.
Click Reply in a notification pop-up.
The Reply button changes to a text field, where you can enter a reply.
Enter a reply and click Send.
The message is sent. If you want to continue the conversation, you can view the entire chat thread.
Click a notification to view the message in context of the full thread.