Microsoft published new version of Microsoft Exchange Server it will be version 2010.

List of the new features and functionality that are included in Exchange 2010:

• New Rights-Protected E-Mail Functionality with Active Directory RMS
• New Transport and Routing Functionality
• New Permissions Functionality
• New High Availability Functionality
• New Messaging Policy and Compliance Features
• New Outlook Web Access Features
• New Unified Messaging Features
• Web Management Interface
• New Exchange Core Store Functionality
• New Administration Functionality in the Exchange Management Console
• New Administration Functionality in the Exchange Management Shell

Download page http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=1898ed2c-2f88-48ac-824e-d3d20fad77d7