Misconceptions
The question, "Are you EDI capable?" is some uneducated hack's way of trying to sound smarter than he is by using a term he doesn't understand.
What I do to answer such questions is to state "PDF only."
Before I started appraising, I used to work for a huge container shipping company. They use EDI to track thousands of container movements and equipment inventory on a daily basis. If the business requires processing tons of data, EDI is utilized to some extent to save time and prevent errors in data transfers.
In the scenario explained by the original poster, most likely Jim Plante, in his post, has assessed the situation well enough. EDI=email
Meanwhile, EDI is very expensive even today. It is cost effective for AMC and major lenders, but for the poor appraiser, it is not. This is why some software vendors have integrated a "poor man's" version of EDI into the package so you can say 'yes' whenever EDI capability is mentioned.
The important thing is, depending on which software you use, this capability may be very limited (only capable of exchanging data with a few partners).
So, a good answer is an emphatic 'yes' to get the foot in the door, and the details to make it work can be ironed out later. Who knows? You may just do fine with PDF and email but I would not treat all these questions as ignorant or 'uneducated' without knowing who you are dealing with.