The service is included in a mobile version of Microsoft Office Communicator due to be released this year. It will take the form of a voice-over internet protocol (VoIP) application that allows Office users to make free voice calls over wi-fi enabled phones running Windows Mobile software. It uses the internet as a virtual phone network as well as accessing e-mail, PowerPoint and other Office applications
Also ein voll in Office integriertes VoIP Tool das wenn man mit Wifi eingeloggt ist eben gratis funktioniert...
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