Mat poses made in Poser 6, will work in Poser 8.

When you make your mat pose file, you will have to include the .jpg file with the package.  

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi