I'm struggling with my Z4M. I was running it on an old windows tower with XP and just upgraded all my windows machines to mac mini's running parallels and Windows 7.
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I can't answer your question yet but I can tell you the throwing $250 at Parallels / W7 doesn't make it easy.. I can't get the printer to communicate. I bought a Serial to USB adapter, which might or might not be the problem. No clue what you are supposed to do when the windows wizard asks what port you are connected to and lists 50 random looking choices.
So far the only Mac solution I have found is through Peninsula-group.com and costs $113 for one user. I downloaded the trial version and it is not working.