//Here's what we know so far about the massive Microsoft Exchange hack

Here's what we know so far about the massive Microsoft Exchange hack

Many security experts remain alarmed about the large, Chinese-linked hack of Microsoft’s Exchange email service a week after the attack was first reported. The breach is believed to have targeted hundreds of thousands of Exchange users around the world. Microsoft said four vulnerabilities in its software allowed hackers to access servers for the popular email and calendar service, and the company urged customers to immediately