We released an update to Yahoo! Messenger 8.1 (for Windows) that includes an important security update. The new version number is 220.127.116.11.
Starting this week, you may receive a prompt to update to this latest version when you sign into Yahoo! Messenger. When the window appears, click the “Update Now” button to install it. The latest Windows version of Yahoo! Messenger is always available from the download page of our website as well.
If you need to check the version number of your Yahoo! Messenger, first sign into Yahoo! Messenger, click on the “Help” menu, then select “About Yahoo! Messenger”.