[Yahoo! Messenger for the Web]

Friends are an instant away on Yahoo! Messenger for the Web

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No download required to IM with friends
Just sign in from your browser to IM with your Yahoo! and Windows Live Messenger™ friends
Send text messages (SMS) to mobile phones
Friend not signed on? No problem — send a text message right to their phone for free

System requirements: Internet Explorer 8 or later, Firefox, Chrome, or Safari.