I first started with Poser 3 (beta).  I was given a copy of it from one of the programmers at MetaCreations.  I think it was during he Bryce3d beta period when MetaCreations gobbled up Fractal Designs and begain re-working Poser.

The beta, initially had the old 2.0 interface but a later copy had the new interface that MetaCreations put on it.  I think Kai did the interface re-design but i am not positive.

I did some tinkering in Poser3 but didn't do much until Poser 4.  I knida dropped away from it a bit for Poser 5 but picked it back up for Poser 6 and been at it since.