Ok, I've never run Parallels, but I need to get a new Mac that will allow me to run either 10.4.1.1 or 10.5.0 in addition to ML (for a number of reasons.) I wanted to find out from Parallels owners whether this will work and what their experiences have been running OS X VMs in general. Will OS X instancing only work on OS X server? Will OS X instancing work via Parallels without Server? Once you have a Parallels OS X combination working on a new Mac can you make an older 10.4-10.5 Virtual Machine?