Enable Message Archiving

• 1). Launch Yahoo! Messenger and sign in to your Yahoo! account.
  
  
• 2). Press "Shift" + "Ctrl" + "P" on your keyboard simultaneously to open the Preferences window.
  
  
• 3). Click "Archive" on the left side of the window and then select the "Yes, Save All of My Messages" option.
  
  
• 4). Click "OK" to save your changes.
  
  

Review Missed Chats in Archive

• 1). Click on "Message" in the File menu of Yahoo! Messenger.
  
  
• 2). Scroll down and select "Message Archive." A pop-up window will appear, showing all previous messages sent and received.
  
  
• 3). Double-click the "Messages" folder in the left window pane to expand it. A list of contacts that you've sent messages to or received them from will appear.
  
  
• 4). Click on the selected contact to view the message history in the right pane. The most recent messages will appear at the top.