Hi, I just got myself a used Mac Mini 2011 server version. It was on Sierra but I wanted to make a clean install so wiped everything and make internet recovery which reinstalled Lion - the original OS I then went to reinstall Sierra which told me that I first had to upgrade to Yosemite or El Capitan to get the server functionality. I had the El Capitan install file luckily on a different machine so went to install that. Only to find out that the server app has to be bought again!? Seriously? I feel a bit cheated here by Apple. So two questions: 1. Is it worthwhile upgrading from Lion to a new server version? It is for home use, sharing files in the family, managing time machine backups of all devices etc, maybe in the future also work as VPN 2. Is there any way of getting a free upgrade? I read a bit on the net, somewhere it seems to suggest that an upgrade from Yosemite was free, unfortunately I don't have a Yosemite install file readily available and they seem to be nowhere on the net. I on purpose looked for the server version of the Mini and I know the app only costs 20 Euros but given the original price of the server Mini this still doesn't feel right. Any advice / guidance would be high appreciated. Thank you.