Microsoft + MCI for Voice over IP telephony? Smart!

I've been watching the VOIP marketplace for months now as we get to see the evolution of telephones from fixed wires and crazy, confusing charges to Internet-based phone systems that offer all-you-can-call dialing for a flat fixed fee, or even without any charge if you're lucky enough to have the person on the other end also using the same service. From Google to eBay/Skype, Vonage to Vbuzzer and Jingle, there are more VOIP solutions than you can shake a stick at. But what about Microsoft? Finally, in a classic Microsoft corporate maneuver, its intentions can be ascertained:

    Microsoft partners with MCI for its VOIP solution

Me? I use both Vbuzzer (they're offering a free trial period too!) and Skype, for North American and overseas calling, respectively. It's a brave new world and I like it!