Switching to an open source OS? OSX is a mix between open and closed source software where quite a bit of its open source code is not updated frequently. Google can't patch Preview, Quicktime, Safari or any other closed source program develop by Apple. Also, Apple is not famous for quickly patching OSX[1]. Quoting Charlie Miller[2,3]: "Mac OS X is like living in a farmhouse in the country with no locks, and Windows is living in a house with bars on the windows in the bad part of town."[4]