2.2 Message Syntax
Calendar objects and meeting-related objects can be created and modified by clients and servers.
Clients operate on Calendar objects and meeting-related objects by using the Message and Attachment Object Protocol, as specified in [MS-OXCMSG]. How servers operate on these objects is implementation-dependent, but the results of any such operations MUST be exposed to clients as specified by the Appointment and Meeting Object Protocol.
Unless otherwise specified, Calendar objects and meeting-related objects MUST adhere to all property constraints specified in [MS-OXCMSG]. An object can contain other properties but these properties do not have any impact on the Appointment and Meeting Object Protocol.<1>
When a property is referred to as "read-only for the client", it means that a client SHOULD NOT attempt to change the value of this property and that a server returns an error and ignores any request to change the value of this property.