I’ve spent about 3 years looking for it as part of the Prodigy Preservation Project, and I have found a substantial amount of archived corporate email and documentation surrounding the development of the service. Not even close to the volume they have here, though!

If you’re interested to read about it, I have been working on reverse engineering Prodigy. More detail at the following two links…

https://www.vintagecomputing.com/index.php/archives/2921/rev...

https://www.vintagecomputing.com/index.php/archives/3064/rev...