You want something like:
=sumproduct(--(text(sheet1!a1:a100,"yyyymmm")="2010May"))

The way you enter a worksheet, is the name followed by an exclamation point.
Even better is to let Excel enter it. When you get to the point in a formula
where you need to enter a range, just navigate to that range using your
mouse. Excel will fill in the proper range address.

Regards,
Fred

"MM" wrote in message
...
Hey all,
Second time on here. You were all helpful the first time round. Here's
the
question:

I have 5 worksheets in my workbook. Each worksheet represents one of our
offices. Column A on each worksheet is a date in the following format:
03-May-10.
I need to count how many times May appears on a specific worksheet.
From what I've seen on other posts, I think I have to work with the
=sumproduct function but I don't know where to enter the specific
worksheet.
Looking forward to your help.

MM