To us, a “customer” isn’t just an entity external to our company for whom we provide services. Some of us don’t directly interface with those types of people but we still have customers. To us, a customer is anyone whom your job functions benefit.
Marketing’s customers are sales, accounting’s customers could be the employees, purchasing, our vendors, etc. See where we’re going with this? In other words, our commitment to customer service is a commitment to going above and beyond every day … and it applies to absolutely everyone.