With instant messaging becoming as hotly competitive among the major portals as search advertising or e-mail hosting, Yahoo! Wednesday said it is testing an upgrade of its Messenger instant-message service by enhancing PC users’ ability to make free worldwide voice calls. The upgrade integrates its existing voice feature – which currently allows users who are logged onto Yahoo!’s PC Messenger to converse in real time and leave voice mail messages – with a call-history archive as well as free ringtones.
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