AD is the first thing I learned to configure using Windows Server and it's up and running since the office started. In the early years, I set my user computers as domain clients but my office users are not really used to the Server system and there are a lot of things they wanted to do on their own on their desktop computers. They don't have time to learn and the boss is not interested in making them to learn, he only cares about sales improvement. So, I switched their pcs back into work-group level and only teach them to access directly to their own shared folders on Servers with limited permission for each user accounts. Even then, they were wrecking havocs, so I created network map-drives and shortcuts on their desktops and never again let them accessed to the Server. I was also considering using FreeNAS but it's been so long since I am in-touched with linux systems and the last time was around 2001. I already tested FreeNAS on VMware and installation was no problem. But Creating user accounts and setting securities is far out of my level.