This may be old hat, but I called Adobe today to ask about a cross platform upgrade for Acrobat Pro 6. All it took was for me to sign and fax a "Letter of destruction" for my registered windows version (saying I will no longer use it and I will destroy it) and $5.95 shipping. A new boxed copy of Acrobat Pro 6 for OSX is now on its way. Goodbye PC, hello mac! 
I was surprised as I expected to have to pay at least upgrade price to switch platforms. Kudos to Adobe.
-jim
I was surprised as I expected to have to pay at least upgrade price to switch platforms. Kudos to Adobe.
-jim