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VoIP was created by companies that nobody had ever heard of, but it's already evolved into a brand-name recognition game. And the more big, well-recognized companies that move into VoIP, the more mainstream it will become. And companies like Microsoft, whose main line of business is not in the telecom realm, will continue to move into this area. The end result will inevitably be integration of VoIP into a whole new set of business and consumer applications. It's already happening. VoIP is no longer strictly a stand-alone application, it's already being incorporated (by third party companies) into Facebook, for example. We'll see things like a cloud-based wordprocessing app with versioning and unified communications, so groups of people working on an app can not only share information and work collaboratively, they will be able to launch a voice call directly from the document.