Avast SBS suite premium v standard

Hi

I’m just about to get AVAST SBS suite for our SBS 2003 Premium server + workstations (after using the free edition at home for the last few years), but we don’t use the ISA server on our server - we use a hardware firewall instead.

So it makes sense (to me anyway!) to use the normal version of the SBS suite - but will it allow me to install the standard version on a premium server? It seems a waste to pay the extra cost per user for something that we aren’t using (i.e. the ISA bit)

Thanks