The New York Times > CNET > Technology > Search Giants Consider Internet Telephone Service: "Yahoo and MSN have long offered rudimentary phone service using their instant-messaging software and a PC. Now there are signs that all of the major Web portals are exploring whether it makes sense to expand those offerings further. Yahoo has already launched a PC-based voice service in the United Kingdom. Microsoft plans to embed voice calling into its enterprise instant-messaging software. And rumors continue to swirl about whether Google is building the foundation for its own VoIP project, starting in the United Kingdom."
Why not just work with Skype, instead of trying to displace it?