I have versions from Poser 8 all the way back to Poser 4 spread across my laptop and a big external hard drive.  Why, you might ask? I don't rightly know. I've moved some things across from version to version, but not all of it.

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8