Yahoo Messenger 7.0.

What's new in Yahoo! Messenger 7.0
Free worldwide PC-to-PC calls**
Enjoy free PC-to-PC calls around the globe. All you and your friends need is Messenger with Voice - and a microphone and speakers (or headset*).

Voice Mail and Call History
If you or your friends are offline or away from the computer, leave voice mail. Check your Call History to see all incoming, outgoing and missed calls, too.

Quick, simple photo sharing
Drag-and-drop photos into your IM window, and use PC-to-PC calling or instant messaging to bring memories to life. you can free download Yahoo Messenger 7.0 now.