T-Systems
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. In 2001 T-System's headquarters were moved from Bonn to Frankfurt, a major IT centre in Germany. In 2002 the remaining 49.9% share of debis Systemhaus was acquired and fully incorporated into T-Systems.