Apple released an update for Mavericks (OS X 10.9), along with updates for Mountain Lion and Lion, the company’s two previous operating systems, on Tuesday. There were no updates for Snow Leopard. Snow Leopard is still available for purchase from Apple, and costs $19.

Gregg Keizer of Computerworld explains Apple’s support systems, and how lack of security updates can leave one in five Macs vulnerable. Here is the link. 

[Image courtesy: Apple]