Link to VHD of Exchang Server 2007 from Microsoft Downloads.
This download enables you evaluate how Microsoft Exchange Server 2007 and Microsoft Office Live Communications Server 2005 together can help create an optimized messaging system for your organization. Microsoft Exchange Server 2007 is designed to reduce the growing cost and complexity of managing a corporate messaging system by providing more control for IT administrators, more value and expanded inbox access for end users, and increased security and compliance for the organization as a whole.
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. Please see www.microsoft.com/exchange/preview for additional information.