Download Messenger

New Messenger 10 Futures:

Instant message with one friend, or conference in a bunch
Easily find or invite friends from other services to come chat with you
All-new Insider with Yahoo! Mail, news, weather, search and more
Send text messages (SMS) to friends’ mobile phones for free*
Show your style with emoticons, Avatars, audibles and IMVironments
Use the built-in media player [...]

About Yahoo Messenger ver. 9

Instant message with friends on Yahoo!, or MSN (Windows Live Messenger)
Make free PC-to-PC calls and PC-to-phone calls for as low as 1cent a minute (plus free voicemail!)
Instant message with one friend, or conference in a bunch
Easily add emoticons & links to your status messages
Send text messages (SMS) to friends’ mobile phones [...]