MB - Out Of Stock Notification Magento Extension adds a notify button into both product detail and category page for out of stock products. By clicking on this button, registered members & guests can enter their information to receive notifications when products are in stock. Also, we provide a sexy-looking Ajax-popup for subscription, so the subscription form is displayed by using a nice Ajax popup with first name, last name and email fields. All of these fields are populated automatically if customers are logged in.