Upgrade Yahoo Messenger
Yahoo Messenger 11.5 and prior versions are no longer supported. Please upgrade to the new Yahoo Messenger, which offers a faster and more reliable platform for group conversations. The update is available for iOS and Android, and will soon be available for Mac and Windows computers. As long as you're signed in to your Yahoo Account you can access the web version of Yahoo Messenger now at messenger.yahoo.com.
After you upgrade, you'll still be able to chat with all your friends. However, you won't be able to send or receive photos, or "like" or unsend messages, with friends who haven't upgraded.
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