Headquartered in Grand Rapids, Michigan, Service Express is currently located in thirty-five offices and fifteen states. SEI specializes in customized on-site data center maintenance for mainframe, midrange and Intel-based servers; for IBM, DEC, HP, Sun, Dell, EMC, STK, Hitachi and NetApp storage. Additional services include: data center relocations, OS support and hardware sales solutions. SEI provides maintenance at substantial savings for customers to extend the life of their post-warranty server and storage equipment.