http://blogs.technet.com/tnmag/archive/2009/03/31/export-compare-and-synchronize-active-directory-schemas.aspxEach Active Directory forest has its own schema, which defines the objects and attributes that the directory service uses to store data. When organizations have multiple Active Directory forests, IT administrators have to manage multiple Active Directoryen-USCommunityServer 2.1 SP1 (Build: 61025.2)