Is there a matrix to understand the difference between your Adobe Forms Central Plans (basic, plus and Acrobat pro). I can't tell if features are limited across plans or just number of forms and responses. I definitely want the capability to save the form online and come back to it later. It says that capability is limited by time, but doesn't specify details. Can you specify that as well? I already have the Adobe Acrobat X Pro desktop version and can develop forms for email distribution.