T-Online, a former subsidiary and now business unit of Deutsche Telekom, is the biggest internet service provider in Germany. It evolved out of the proprietary German Bildschirmtext (BTX) information service in 1995.T-Online had an estimated 13.4 million customers in Europe in the first quarter of 2004 and a sales volume of about 1.58 billion Euro in 2002; the business unit, which is based in Darmstadt, has about 2600 employees, of which 2000 are located in Germany. The T-Online brand is also used in Hungary, Austria and Switzerland.
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