Download the Microsoft Office Communications Server 2007 and Microsoft Office Communicator 2007 Public Beta today:

http://www.microsoft.com/technet/prodtechnol/beta/ocs/default.mspx

Office Communications Server 2007, the next evolution of Live Communications Server, delivers streamlined communications for your users so they can find and communicate with the right person, right now, from the applications they use most—like Microsoft Outlook. And when you download the beta software, you're automatically registered to access valuable beta resources assembled in one convenient Beta Central location.

Please review Office Communications Server 2007 system requirements before you proceed. Actual requirements and product functionality may vary based on your system configuration.