The contract, which provides a network as well as mobile and VoIP services to more than 170,000 employees, was originally signed in 2002, and at the time was BT Global Services’ first global telecommunications outsource.
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This is the third time the contract has been extended, and now includes services such as audioconferencing and videoconferencing.
The €1bn outsourcing contract was last renewed in 2010 as part of a technology refresh deal worth an extra €173m (£144m).
“We are becoming a more agile business and introducing more sustainable ways of working for our employees, customers and suppliers, as well as the two billion consumers who rely on our products every day,” he said.