The following properties are not used or supported in MAPI 1.0:
PR_ATTACHMENT_X400_PARAMETERS
PR_CAPABILITIES_TABLE
PR_CONTAINER_CLASS
PR_CONTAINER_MODIFY_VERSION
PR_CONTENTS_SORT_ORDER
PR_CONVERSATION_KEY
PR_CREATION_VERSION
PR_CURRENT_VERSION
PR_DISC_VAL
PR_FILTERING_HOOKS
PR_HEADER_FOLDER_ENTRYID
PR_IPM_ID
PR_IPM_OUTBOX_SEARCH_KEY
PR_IPM_SENTMAIL_SEARCH_KEY
PR_IPM_SUBTREE_SEARCH_KEY
PR_IPM_WASTEBASKET_SEARCH_KEY
PR_MODIFY_VERSION
PR_PARENT_KEY
PR_PRIMARY_CAPABILITY
PR_TRANSPORT_STATUS
PR_X400_DEFERRED_DELIVERY_CANCEL