Version 8.1 makes big strides in increasing the stability, performance, and reliability of Yahoo! Messenger. While most of these changes take place “under the hood” and won’t jump out at the casual fan, you will be glad you upgraded. We strongly recommend that you upgrade to Yahoo! Messenger 8.1.

To find out what version you're using, open Yahoo! Messenger and click on the Help menu near the top. Then select "About Yahoo! Messenger" to see your version number. If it’s 8.0 or earlier, just visit the Yahoo! Messenger download page to download the newest version.