My old AD server running 2012 r2 finally bit the dust. While I'm ordering new server hardware, I am also questioning the need for Windows server OS. Originally, I set up a domain as a training and test bed, but gradually I find less need for either. I know originally the server OS was more robust than the client OS's and I wonder if that is still true. However, some of the programs and hardware I have tried in the past to add are not supported by server OS's. So, on balance is there any reason for me to install a server OS on the new server box i have ordered?