I'm getting ready to upgrade from 11.5.1 to 12 on a new iMac G5. I have the educational version for my class and I've heard that 12 will not actually upgrade version 11.5.1. Is this true? Also, considering that I have Designer, Architect, Landmark, Spotlight, etc., will I lose any fuctionality if I uninstall 11.5.1 and then install 12?