Exchange Server 2007 Beta 2

Microsoft Exchange Server 2007 provides built-in protection technologies to help keep the e-mail system up and running and better protected from outside threats while allowing employees to work from wherever they are using a variety of clients including Microsoft Outlook, Outlook Web Access, and mobile devices. Exchange Server 2007 makes it easier for IT to deliver these new capabilities to their organizations by making the messaging environment easier to manage and more cost efficient.
Download: Microsoft Exchange 2007