"Apple Computer has strongly recommended that all product development be done under Mach-O, instead of the older, deprecated PEF platform. As a result, and because continuing to support PEF means that Adobe would have to write substantial bridge code, Adobe has opted to move Acrobat to a fully compliant Mach-O application.

"This allows [Adobe's] developers and customers a forward-looking perspective on the technology, allowing plug-ins to have maximum compatibility with future versions of the Apple OS X."