Microsoft will continue to invest over $1 billion annually on cyber security research and development in the coming years, a senior executive said.

This amount does not include acquisitions Microsoft may make in the sector, Bharat Shah, Microsoft vice president of security, told Reuters on the sidelines of the firm's BlueHat cyber security conference in Tel Aviv.

"As more and more people use cloud, that spending has to go up," Shah said.

While the number of attempted cyber attacks was 20,000 a week two or three years ago, that figure had now risen to 600,000-700,000, according to Microsoft data.

Long known for its Windows software, Microsoft has shifted focus to the cloud where it is dueling with larger rival Amazon.com to control the still fledgling market.

Read more at Reuters.