Yahoo Messenger Discontinued July 17th

The announcement comes just six months after Yahoo and AOL's parent company Oath discontinued AIM (AOL Instant Messenger).

Yahoo Messenger will only continue working normally until July 17, 2018.  After that date, you will no longer be able to access your chats and the service won't work. Your Yahoo ID will continue to work for other Yahoo properties like Mail and Fantasy.
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If you are still using Yahoo Messenger, now would be a great time to switch to a end-to-end encrypted messenger such as Signal Private Messenger or WhatsApp.