For years now, we've been watching an ongoing tit-for-tat battle between VMware and Parallels. Both companies make virtualization apps--VMware Fusion and Parallels Desktop--which let you run Windows (and other operating systems) on your Mac. Every year or so, the two companies release new versions of their apps, each trying to one-up the other. VMware has just fired its salvo for 2013, releasing version 6 of its Fusion and Fusion Professional virtualization apps.
