The Backorder extension allows store owner to continue sell the products which are currently running out of stock. Its very useful to hold customer with Back Order before they browse other sites. It supports to product types that is, Single, Configurable, Grouped and Downloadable product.
This extension allows customer to pay in advance for the products which are out of stock. Customer will be notified via email once products is in stock.
For downloadable products, download Items link will be sent to customer along with email notification customer can download item from that Download link.
Magento Editions Compatibility:
Community Edition: 1.7.x, 1.8.x, 1.9.x