I want the system to send an email to the admin when products reaches zero in the stock level.

Webbia - I hope you don't mind the observation - there's not much point adding your message twice - it doesn't get you more replies and just causes some confusion .
 
You primary post is here:
http://www.viart.com/admin_email_sent_when_products_are_out_of_stock.html

Well, I posted it here so that ViArt can see that I am requesting that function. Not because I want an answer.
And I wasn´t sure that they read the threads in the Discussion department as thorougly to see my question and understand that I want that function.
Better be overexplicit, right?

I am not sure how much is read so I ensure a hearing by sending the request through support