I am an adult computer trainer, linux system and networks at a level of 2 years after college.
I train people from 20 to 50 who choose to change their profession.
I use NethServer as a service aggregator after teaching the installation, administration and individual use of these (dns, samba, postfix, dhcp, squid, etc ...).
I came to NethServer after trying Zentyal and ClearOs but their business model is not there for educational use.
I also think of implementing NethServer for small businesses of 1 to 15 people to replace the Microsoft Windows ecology (doctors, geologist, wine merchants, ...) some with privacy and security constraints.
Have a good day.