The first dialog gives you the opportunity to check for updates to the setup files before you proceed.
Moon Spots: circular or semi-circular areas of white or a lighter color on a dark background.
Leopard Spots: rosette like cluster with a different colored center.
From the location where you have stored your Exchange 2013 files run
However, it requires some knowledge and experience.
It is actually easier to tell if a recipient’s server supports TLS than to tell if a particular message was securely transmitted.
Without authentication SMTP is not even aware of an authenticated email originator.
In order to achiev confidentially, two different approaches are generally used: Encryption with [S/MIME, PGP] can only be achived in case the originator as has access to the public key of the recipient which is on a large scale still difficult and only solved (to my oppion) in the PGP Pretty Good Privacy case.