I believe I found the thread you were looking for. It wasn't just
sumproduct(n( they used, it was sumproduct(n(threed(

Threed is part of an addon that turns a 3D reference into a 2D one, but in
the same addon there is countif.3D.

That addon is morefunc and can be downloaded (free) at:

http://xcell05.free.fr/morefunc/english/


"Mrfish" wrote:

I would like to do a 3d countif across multiple sheets. I simply want to
count the cells containing 'D's. Something like =COUNTIF(Start:End!D43,"D")
would be ideal if it worked!

Unfortunately I see now that countif() doesn't work with a 3d reference. I
see some other answers here have used a =sumproduct(n(... function to get
round this, but didn't understand it.

Can anyone here help?