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Yahoo Instant Messenger is an instant messaging program that lets you send instant messages, pictures and files to other users. Yahoo Instant Messenger also lets you enjoy free PC to PC calls around the world. All you and your friends need is Messenger and a microphone and speakers. If you or your contacts are not online or away from the computer, you can leave a voicemail message. Just like a normal phone you can check your Call History to see all incoming, outgoing and missed calls.According to Yahoo, from version 8.1, Yahoo Messenger is supported by Windows Vista.