Our IT Dept. is going to upgrade our domain controllers and has said that we should "contact your vendor to confirm that it (Delphix) supports Domain Controllers running Windows Server 2012 R2 and the forest functional level of
Windows Server 2012 R2"
Delphix works with any LDAP implementation, including AD/Windows. But we strongly recommend that you first test the Delphix Engine against a test server running the new configuration, before you upgrade your production AD server to that new configuration.