SAP
Apple is the most profitable company in the world. Everyone knows that its secret weapon is innovation, and one of its key innovations has been to use SAP software to manage inventories and orders.
Apple uses SAP software for their App Store, iTunes, online store, and other online store services. They also use different SAP systems for their finance department and Human resources.
SAP has helped Apple to bring them closer to their customers and help them develop relationships with them.
This means that many of Apple's partners, including HP, CitiGroup and Vodafone, also use SAP to manage their complex technology needs and that Apple has a broad network of existing users amongst some of its key suppliers.