Yahoo announced today that its Yahoo Messenger chat program is being discontinued on Juy 17th 2018. They are now directing users towards their Squirrel chat app that is currently in beta. Squirrel allows you to create chat rooms with various channels that you can join to discuss a particular subject. For those who wish to test Squirrel, you can email [email protected] to request an invitation. Yahoo has a page where you can download your chat data for the next 6 months. After that, you will no longer be able to access your chat history.
Source: https://www.bleepingcomputer.com/news/business/yahoo-messenger-now-joins-the-list-of-discarded-chat-programs/