The importance of securing your mail, filemaker, file servers for your business and clients. This is something all businesses should take into consideration when creating a new service on their network and this can be helped with the use of SSL/TLS Certificates.
SSL/TLS is a protocol suite for encrypting an arbitrary protocol. This is an important design decision made as the very groundwork of the internet itself was being laid out. Instead of having to build encryption into each and every proprietary protocol (think FTPS), we now have a common framework for forging an encrypted channel, and then sending information through it such that only the sender and the intended recipient have access to that information. This helps prevents man in the middle attacks, where someone sits in between you and the target completely transparently, forwarding information along in both directions on-the-fly but keeping their own copy for nefarious purposes.