Microsoft yesterday sued former executive Kai-Fu Lee and Google, hours after the search engine announced that Microsoft's former corporate vice president was to head up Google’s new product research and development centre in China.

Microsoft said in a statement: “Creating intellectual property is the essence of what we do at Microsoft, and we have a responsibility to our employees and our shareholders to protect our intellectual property.”

It added: “As a senior executive, Dr Lee has direct knowledge of Microsoft’s trade secrets concerning search technologies and China business strategies. He has accepted a position focused on the same set of technologies and strategies for a direct competitor in egregious violation of his explicit contractual obligations."

Microsoft is asking the Court to require Dr Lee and Google to honour the confidentiality and non-competition agreements (known as restrictive covenants in the UK) that Dr Lee signed when he began working for Microsoft.

Google has made no comment on the suit as yet.

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