We explain which Macs, iMacs and MacBooks will upgrade to OS X 10.9 Mavericks when it launches this Autumn. (See also: Get your Mac ready for OS X Mavericks.) The next version of Apple OS X is set to arrive this Autumn. OS X 10.9 Mavericks is a hotly anticipated upgrade to Apple's desktop and laptop operating system, offering a string of new features and new technology. As you're reading this the chances are you are a Mac user, excited about the opportunity to upgrade to Mavericks. But not all Macs and