1. Yes, Michael and Victoria still work in Poser 11. As far as I know, all versions still work. From version 1 to version 4.

2. As far as I know, your skin textures will work on the models they were created for, no problem. If you want the textures to fit other figures they were not created for, I'll have to let someone else answer that. You could though, look into getting a texture converter to convert your existing textures to fit the newer figures.

3.Yes, you can put the main Poser program on your main drive and your libraries on another drive. It should be fairly easy on both your mac or Windows Machines. Hooking a Mac drive to a Windows drive may be more interesting. Don't know if that can be done.