Dirk, if you mean the old written-by-aD address-book package, I tried
it back in early 2001 on ACS 4.2beta, and it was basically junk. A
few good UI ideas, but the data model was lousy, even limited testing
gave me very mysterious unfixable bugs (either in it or in the
underlying Places package, I forget), and it just plain never really
worked at all. (I may have some old emails somewhere detailing
specific problems, but I doubt anyone cares by this point...)
Given the state address-book was in back then, I doubt anyone ever
improved it. Or even used it! There should be old posts around by
Jon Griffin
and others saying how bad address-book and places were, describing
alternatives, etc.