Delegate Access
It is entirely possible that a caller does not have a mailbox on the system. In this case, the caller must explicitly specify the mailbox that is being accessed because there is no way of determining this from the authenticated caller’s identity. Such access is considered delegate access, in which the primary owner of a mailbox has delegated certain rights to another account. Note that this could include "owner" rights to the mailbox as mentioned earlier.
Consider the garage-cleaning scenario from the beginning of the chapter. You are standing on Greenbriar Lane, but you do not live on Greenbriar Lane. Someone else on the scene, John, gives a command: "Clean out the garage." He needs to provide you with more information. Which garage ...
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