Using ‘virtual machines,’ VMware Fusion even lets OSes running side by side communicate with each other, such as copying one file on OS X and pasting it in the Windows VM. VMware Fusion 3.1.3, a maintenance update that resolves some known issues and includes improved functionality for Mac users, is now available as a free upgrade for all VMware Fusion 3.x users, the developers announced today.Ī powerful virtualization solution, VMWare Fusion allows Mac users to run multiple operating systems on their machines, simultaneously.