3.1.3.3 Initialization Through an Offline Address Book
Messaging clients MAY<54> obtain address lists in an OAB by using the OAB Public Folder Retrieval Protocol, as specified in [MS-OXPFOAB]. Each address list, in turn, contains information about objects in that address list, using the OAB Format and Schema Protocol, as specified in [MS-OXOAB]. After one or more address lists from an OAB are obtained, messaging clients navigate any of the address lists to perform the lookups that are required to perform these operations.