Trust me, Acrobat Pro will allow you to both save the filled out PDF AND save the XML, separately. Reader WILL NOT allow you to do this, but if you have an email button. The point of reader extensions is to allow people without Acrobat to be able to save a filled out form, thus why reader is free. Reader extensions works on a form by form basis, so it can be portable. Acrobat Pro, which ISNT free, allows you to do all of this, which is why it isnt free. The point is that Adobe doesnt want anyone to have any save capability without having to pay for it first. If you have a form with an email submit button, you can open it in reader, click it, and email the xml with the values in it.