I have just upgraded to Poser 6, and I have 20+ GBs of content in my Poser 5 Runtime folder. I am 'twixt'n'tween over folder reorganization vs multiple runtimes, and in my search for enlightenment, at DAZ (link: Poser Multiple Runtimes revisited) about a third the way down the page, Cliff Bowman says (in a 23 Mar 05 update) that Poser 6 users can ignore the delta libraries. My delta libraries are nearly 1 GB of my total Runtime folder, so my question is, can I get rid of them (delete them) or not. I will not be maintaining backwards compatibility with Poser 5, and if they are not needed for Poser 6, then I would like to reclaim the disk space.