What version of the Exchange 2007 Management Console needs to be installed on the Spotlight on Messaging Server.
Spotlight on Messaging Installer fails on prerequisite check.
If your organization contains Exchange 2007 servers and Exchange 2000/2003 servers, you must install ESM and EMC. MAPI CDO is not required.
If your organization contains Exchange 2007 servers and Exchange 2010 servers, you must install EMC 2007 Service Pack 2 or later.
The Exchange Management Tools version installed on your Spotlight on Messaging computer must match the Exchange version installed on your Exchange server. For example, if you have Exchange 2007 Service Pack 2 installed on your Exchange Server, you must have Exchange Management Console 2007 Service Pack 2 installed on your Spotlight on Messaging computer.
NOTE: Microsoft Outlook should not be installed on the same computer where you have MAPI CDO installed.
For more information on Spotlight on Messaging prerequisites consult the "System Requirements" section of the Release Notes which can be found in the Documentation folder included with the software download.