As of 2012, T-Systems was the largest German and one of the largest European IT services companies, serving customers such as WestLB, Old Mutual,[2] Daimler, Volkswagen, Royal Dutch Shell, Sanlam, Murray & Roberts,[3] BP, TUI AG, De Agostini, Philips, MAN SE, Airbus, E.ON.

[8] In June 2018, T-Systems announced it will cut 10,000 jobs in 3 years, including 6,000 in Germany, with the hope of returning the company to profitability.

[9] T-Systems was founded in 2000, when Deutsche Telekom acquired a 50.1% stake of debis Systemhaus, one of the largest IT services companies in Germany at the time.

Most of Deutsche Telekom's existing service and IT businesses were then merged and incorporated under the control of one single company, the newly founded T-Systems.

[citation needed] Since then, T-Systems made a number of acquisitions, most notably the purchase of gedas, the IT subsidiary of Volkswagen Group in December 2005.