In the product Stock filter, what is the difference between Out of stock and Unavailable?

Both show products that have no stock left. The difference is whether customers can still order them.

• Out of stock: no stock, but Sell when out of stock is turned on for the product. Customers can still place orders.
• Unavailable: no stock, and Sell when out of stock is off. Customers cannot buy these until you add stock.
• In stock: products with stock, products with Track inventory turned off, and downloadable products.

To use the filter, go to Products → Products, click Filters and pick an option under Stock. To fix an unavailable product, open it, enter a new Quantity in the Inventory card and click Save.