The ADAM schema may have to be adjusted for use with Identity Manager. The resource schema and the identity template in an LDAP resource often contains a reference to a unique identifier (or account ID). ADAM differs from other LDAP implementation in that
In ADAM, objectclass definitions only allow a single naming attribute. (A naming attribute is an attribute that appears in the leftmost RDN component of the DN.)
The uid attribute is defined as multi-valued.
The cn attribute is defined as single-valued and cannot be longer than 64 characters.
The ADAM schema defines the attribute index configuration. Each attribute definition entry in the schema has a searchFlags attribute. For example, the definition for Uid is located at cn=Uid,cn=Schema under the schema context. The searchFlags attribute is a bitmask and values 1 (create index), 2 (create index in each container) and 64 (index to support efficient VLV queries) are related to indexing.
Refer to the Microsoft documentation on updating the schema in an ADAM instance.