When you are setting up an Internet Facing CRM you need to use an STS service which often means ADFS. So which version are you running?
Now, CRM of different verisons supports different versions of ADFS and the complete list is in your implementation guide. But how do you check for which version you are running. It turns out you don't. But have no fear, Jorge is your man here. This blog https://jorgequestforknowledge.wordpress.com/2014/02/23/gathering-architectural-details-from-your-adfs-infrastructure-adfs-version/#comment-17198 helped me to determine which verison that was installed on a system. Really, you have to look at how the GUI looks and see if there are files available.
This feels so 2015.
Have fun and thanks Jorge!
Developer at CRM-Konsulterna