I have some problems with this formula.
=SUMPRODUCT(((('[excell sheet.xls]Spreadsheet1'!$C$4:$C$9995=$A1340)*('[excell sheet.xls]Spreadsheet1'!$D$4:$D$9995>=$B$1))+(('[excell sheet.xls]Spreadsheet1'!$C$4:$C$9995=$A1340+1)*('[excell sheet.xls]Spreadsheet1'!$D$4:$D$9995<$B$1)))*('[excell...