Exchange_v_rgbThis download includes the Exchange Server Active Directory Schema Reference, which provides information about the changes that Microsoft Exchange Server makes to the Active Directory schema when it is installed. The Exchange Server Active Directory Schema Changes Reference includes changes made by Exchange Server 2010 SP2, Exchange Server 2010 SP1, Exchange Server 2010, Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007, and Exchange Server 2003.

Go get it @ http://www.microsoft.com/download/en/details.aspx?id=5401.