Did you change the range in the formula to mathc yours?
=SUMPRODUCT((B1:B6="Open")*(MONTH(C1:C6)=8))
If you are concerned with the year as well as the month then,
=SUMPRODUCT((B1:B6="Open")*(MONTH(C1:C6)=8)*(YEAR( C1:C6)=2005))
HTH
Steve
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