The Mailbox Contents Synchronization Web Service Protocol is used for providing the necessary information to keep a local message store synchronized with the contents of a mailbox on the server. Clients use the SOAP protocol, as described in [SOAP1.1], to contact the synchronization service.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in [RFC2119]. Sections 1.5 and 1.9 are also normative but does not contain those terms. All other sections and examples in this specification are informative.