Microsoft Open Volume Licensing Microsoft Open Volume Licensing offers deep discounts for businesses making large purchases. Open Volume goes by a point system and requires a minimum initial order of 500 points within a product pool. Product Pools are separated into three categories – Applications, Systems, or Servers. To see a list of all the porducts with the product pool they belong to, see Open Volume Licenses. Each license carries a unit value of at least one point; with many licenses counting for higher unit values.