As a collector, I have an interest in old Apple networking software and hardware, and after a couple of years of looking hither and yon, under every bush and tree, and climbing every mountain just in case someone might have dropped it up there — I have finally found a copy of the abortive and semi-mythical Apple Powershare Collaborative Server. This was a Powertalk-Appleshare related product from the 7.1-7.5 era, pre-dating the emergence of the web as we know it (and which did not sell at all well at $1000, judging by the paucity of copies of the software available). The plug was pulled with 7.6, which dropped the whole Powertalk hot potato completely.

Now if I could just find Claris OfficeMail! I have the demo, but not the Ding-an-sich.