If you have the disk space, I'd leave both P6 and P7 on. What's to lose? With Carrara 6, my need to use Poser has diminished drastically. I don't have DAZ's Mimic so I still periodically use Poser 7 Talk designer but that means I also have to render those projects with Poser. Walk Designer is still nice to have around but I'd use P6's to avoid compatiblity issues with Carrara. Other than Walk and Talk designers, Carrara 6Pro can really handle most everything else - especially once the bugs in the releasee version get ironed out. The Carrara hair is amazing.