Have a look at http://www.xldynamic.com/source/xld.SUMPRODUCT.html
it has a very comprhensive explanation of the sumproduct function.
print it out
keep it
you will use it again

--
Greetings from New Zealand

"Joe@Willscot" wrote in message
...
I am trying to find out how to look up data between two specific dates.
i.e.
The amount of money that I have used from a specific account between 1 Jan
09
to 28 Feb 09?