What is Magento 2 Out of Stock Notification Extension? - The Out-of-stock notification is a great tool for connecting with the customers. Magento 2 Out of Stock Notification helps store owners to inform customers about the availability of all products in the store. - With help of this extension, customers, as well as guest visitors, can subscribe for specific out-of-stock products and get notifications via email. - Customers can subscribe for simple, configurable, and bundle products. - This extension allows particular customer groups for stock notification subscription like: general, wholesaler, retailer.