"When governments seek information from Microsoft relating to customers, we strive to be principled, limited in what we disclose, and committed to transparency," said Smith.

Later in a blog, Smith said, "If a government wants customer data - including for national security purposes - it needs to follow applicable legal process, meaning it must serve us with a court order for content or subpoena for account information," it said.

"We only respond to requests for specific accounts and identifiers. There is no blanket or indiscriminate access to Microsoft's customer data," he wrote.

"Like all providers of communications services, we are sometimes obligated to comply with lawful demands from governments to turn over content for specific accounts, pursuant to a search warrant or court order," he said.

Recent leaked government documents have focused on the addition of HTTPS encryption to Outlook.com instant messaging, which is designed to make this content more secure as it travels across the Internet, he said.

According to Microsoft official there are significant inaccuracies in the interpretations of leaked government documents reported in the media last week.

"We have asked the Government again for permission to discuss the issues raised by these new documents, and our request was denied by government lawyers," he said.

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