Previously called MSN Messenger, Microsoft's Windows Live
Messenger (WLM) is an advertisement-supported instant messaging service. It
currently has more than 27 million active registered users worldwide. WLM offers
file sharing, PC-to-PC calling, time-stamped messages, offline notifications and
other features. In 2006, Microsoft and Yahoo announced an interoperability
agreement which would allow users on either system to communicate with each
other. WLM is available for the PC and mobile applications also.
Quick Reference: Internet Telephony Internet telephony can be basically broken down into three categories consisting of PC-to-PC telephony, PC to Phone, and Phone to Phone.
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