1. Microsoft Office Communications Server 2007: Though far from surprising, the official October launch of Microsoft's Office Communications Server 2007 was a huge step forward simply because it made real the possibility that voice will someday become just another application running on corporate networks. As such, the announcement forced enterprises and vendors alike to get serious about their responses to a game-changing question: whether stand-alone PBXes will even be necessary in the future.

The Top 25 VoIP Innovations of 2007 - VoIP News