A great tool for catching up on the sales that you may have missed while the product was out of stock!
How it Works:
A customer is browsing your store and comes across a product that want, but it appears to be out of stock. If the Product Quantity is "0" the button "Notify me when available" will be displayed on the Product details page (and optionally on the Product categories list, Search results pages - you have the ability to enable or disable on the admin panel) and the Add to cart button will be hidden. If the customer clicks on the "Notify me when available" button a drop down form will appear where the email address can be entered and the subscription request can be sent. If the customer is logged the email field will be completed automatically.