writes: Though Microsoft hasn't yet patched its Internet Explorer web browser in 2014, it did patch IE at least once every month in 2013. According to HP's 2013 Cyber Risk Report, more researchers tried to sell IE vulnerabilities than any other product vulnerability
Link to Original Source
"These are the users that adversaries are going after; they tend to more likely be in business environments," Jacob West, CTO of HP's Enterprise Security Group said. "IE is the most prevalent browser on the systems that attackers want to compromise."