Abstract: A system, method, and apparatus are provided for migrating contacts (e.g., records identifying contacts) from one domain to another. Each record includes various fields corresponding to a single contact or other entity known within the first domain. The migration process may involve configuring multiple queries from the field data, for querying the second domain or system to identify (or to attempt to identify) matching entities known within the second domain. One or more exact queries may be configured to identify specific entities within the second domain, based on entity-specific data, for example. Other queries may be more general and may match multiple entities known within the second domain. For records for which no exact query identifies an entity, one or more general queries may be executed to identify multiple entities, which may be subsequently ranked based on the likelihood that they are the entity that corresponds to the record.