Hello
I have the following excel database

Area Start End
Orange 15/05/08 18/05/08
Orange 18/05/08 27/05/08
Blue 01/04/08 25/04/08
Blue 02/05/08 17/05/08
Yellow 28/04/08 17/05/08
etc.

On a separat worksheet i would like to calculate the following for every day
of the year.

01/01/08 How many Orange where active on that day
01/02/08 etc.

I tried it with summproduct but can't figure out the correct formula to
calculate between the start and end date. Thank you very much for your help.