3.2.5 Message Processing Events and Sequencing Rules
The delegate's client can identify that a Message object has been received on behalf of the delegator when the received representing properties are present and different from the recipient properties. The received representing properties are specified in [MS-OXOMSG] section 2.2.1.
If the received representing properties are present, they take precedence over recipient properties to identify the delegator Address Book object.
When the delegate's client is processing a meeting-related object received on behalf of a delegator, the delegate's client creates or accesses the corresponding Calendar object in the delegator's special folder. For more details about processing a meeting-related object, see [MS-OXOCAL].
When the delegate's client is processing a task request on behalf of a delegator, the delegate's client creates the corresponding Task object in the delegator's special folder. For more details about processing a task request, see [MS-OXOTASK].