T-Systems is a German global IT services and consulting company headquartered in Frankfurt. Founded in October 2000, it is a subsidiary of Deutsche Telekom.As of 2012, T-Systems is the largest German and one of the largest European IT services companies, serving customers such as WestLB, Old Mutual, Daimler, Volkswagen, Royal Dutch Shell, Sanlam, Murray & Roberts, BP, TUI AG, De Agostini, Philips, MAN SE, Airbus, E.ON.