This is not a terribly surprising revelation in the grand scheme of things.  At the end of the day, attackers still prefer target rich environments and Windows is still the most prevalent platform to target.  That said, vulnerabilities should be taken seriously on every platform because issues like spear phishing exist and criminals are more than willing to adjust their attack vector if the target is worth enough.

http://thehackernews.com/2015/02/vulnerable-operating-system.html