Returns the full email address of a name or resource.
AFTKN_AB_RESOLVE_FULLNAME or 817
ANSISTRING AddressBookResolveFullName (ANSISTRING FullName; [ANSISTRING UserID])
User or resource’s DisplayName, such as "First Last" or UserID.
(Optional) User ID of the mailbox that contains the Address Book information. Use this information to search in a proxy mailbox.
Full EmailAddress or FullAddressText (Domain.PostOffice.UserID).