If you are using messenger in yahoo mail and it’s old version, then this might be the time to upgrade new version. Messenger in Yahoo Mail Classic have been shut down from March 22 2013. This means that you will no longer be able to send Instant Messages to your contacts from Yahoo! Mail Classic.
A more close look on “notification” shown in yahoo mail page after successful login.
No worries because where there’s problem there will be solution too. You still have two possible ways to use Yahoo! Messenger:
- Upgrade to the new Yahoo! Mail, where Messenger continues to be available. You can then send IMs directly from your inbox, as you did before.
- Use the Yahoo! Messenger client. If you don’t already have it, you can download the Yahoo! Messenger client here.
Reference : Mail Classic Help