PC-to-Phone Calls

Main article: Windows Live Call/a>

In addition to PC-to-PC calls that have been supported in previous versions, Windows Live Messenger now supports PC-to-phone calls with Windows Live Call. In the US, this feature is supported by Verizon, branded as "Verizon Web Calling". Orange France also has a similar service. This feature is only available in selected countries, including the US, the UK, France, Germany, the Netherlands, Austria, Ireland, Finland, Belgium, Spain, and Italy. Verizon ended service in August 2008 and was replaced in the US with Telefonica, while Orange will offer the service for the rest of the world.

Resource: Wikipedia