The 30-day trial only includes the cloud service. If you are interested in evaluating Windows 7 Enterprise, please look into the 90-day trial.
Get it at http://www.microsoft.com/en-us/windows/windowsintune/try-and-buy.aspx
Read my favorites blogs:
Designing a backup less Exchange 2010 Architecture
Step by step guide for upgrading Active Directory from Microsoft Windows 2003 to Microsoft Windows Server 2008
Microsoft Exchange 2010 CAS Array – Steps and Recommendations
Appear Offline in Microsoft Office Communicator Server 2007
Microsoft Exchange 2010 Test cases
Microsoft Exchange Server 2010 Disaster Recovery