Authors could "enable" additional features for users of the free Adobe Reader, such as digital signing, local form saving, and participation in shared reviews. Historical Context and Lifecycle
Organizations that built complex XFA workflows on Acrobat 9 Pro Extended are stuck. Migration to HTML5 forms is expensive. adobe pro 9 extended
At the time, Adobe was competing with and early cloud document services. Acrobat 9 was the last version before Adobe shifted to the "Acrobat X" ribbon UI (2010) and began stripping out "non-core" features like embedded 3D and Flash. Authors could "enable" additional features for users of