A data structure that represents a person is created. The data structure comprises a person object. The person object comprises one or more contact objects. When it is determined that the person is a global address list contact, first contact information for the person is obtained from a global address list store and stored in a first contact object. When it is determined that the person is an email contact, second contact information is obtained from a contact store and stored in a first memory cache. When it is determined that the second contact information includes a global address identifier, the global address identifier is stored in the second contact object. A person identifier is created for the person that identifies the person. The person identifier is stored in the first contact object and in the second contact object.