188.8.131.52.2 RopExpandRow ROP Response Buffer
ExpandedRowCount (4 bytes): An unsigned integer that specifies the total number of rows that are in the expanded category.
RowCount (2 bytes): An unsigned integer that specifies the number of PropertyRow structures, as specified in [MS-OXCDATA] section 2.8.1, that are contained in the RowData field. The value of this field MUST be less than or equal to both of the following:
The value of the MaxRowCount field in the ROP request buffer; and
The value of the ExpandedRowCount field in the ROP response buffer.