Ok, I'm officially confused now. (That's not hard).
Quite a while ago, VErtigo (the old name of the product now called Groupwise Mailbox Management) was a Windows tool that was marketed as Enterprise Management solution, able to do mass operations on many/all accounts at once, like e.g copying a rule from one user to all others. Also being able to see which user had proxy rights given to what other user (for all users at once) and so on.
Now that Windows Tool seems to be gone (the most recent version documented, Groupwise Mailbox Management 18.0.1) can not be downloaded any more, neither via the trial link gicen in the documentation, nor from Gwava Customer Center, the link is dead.
Apparently, the function is now supposed to be in the Groupwise Admin Interface, yet it totally isn't. All you can do in the GW Admin Interface is see what rules, proxies, shares and whatnot *individual* users have (that's a functionality which exists in every Groupwise 18.2 system now), and, if you have an enterprise messaging license, you can also change/configure most (not all) of such setting from the admin, but again *only* for individual users.
So, may I ask, where is the former enterprise level manegement product, that could manage whole systems at once? How can I see (I don't care about changing at this point) e.g the folder shares and proxy access of *all* my users at once now?