I recently purchased one of the new iMacs with the retina display and installed VMware Fusion 5 on it with Windows 7. The iMac is running 10.8 and is 64 bit. My problem that I'm noticing is that when Windows boots up, the mouse inside the virtual machine doesn't reach the edges. For instance I'm not able to reach the start menu or taskbar at the bottom of the screen. If an application is opened in full screen, I cannot reach the toolbars at the top or close the application. It's seems as if the mouse isn't calibrated to the correct resolution as I can only move the mouse within say 50-75 pixels of any edge before it breaks out of the virtual machine. The attached image shows what I'm talking about. The red line roughly designates the edge the mouse is able to get to before it exits the VM. I have not installed VMware Tools either. I've used other iMac's with VMware Fusion 5 and have not run in to this issue before.