FAQ - Do orders in a shopping cart count towards the inventory control?

Yes, but for a limited time.  To prevent over-selling items, the system places a temporary "hold" on inventory controlled items.  When a User places an item in their cart, it will be "on hold" for them and they will have 15 minutes to complete the check out process before that item is released back into the available inventory.

If the User attempts to complete their purchase after an item is Sold Out, the User will be notified that the item is no longer available.