It could be that what Bagginsbill describes is the end of the story, which would be TREMENDOUS.

When I purchased Poser, there was a PC version and a Mac version.  There were PC and Mac versions of content.  I was just assuming that if I bought a Mac, that my PC versions of the Poser software and content would not always run, or if it did, that there would be extra hiccups unless I got the Mac versions.

If that is wrong, hooray! One less thing to worry about.