A few years ago, a computer buyer who wanted an Apple Mac may have been forced back into the PC store in order to run the applications he already had, needed, or wanted. Now, though, the Mac and its OS X operating system have risen in popularity and permeate the consciousness of computer buyers around the world — thank the iPhone and iPod for that. So, is Windows application envy a thing of the past for Mac owners? Take Microsoft, for example. The company ditched its Internet Explorer for the Mac browser years ago, but it has delivered increasingly robust versions of Office.