HT4886: Mac mini Server (Late 2012 and Mid 2011): How to install OS X Server on a software RAID volumeLearn about Mac mini Server (Late 2012 and Mid 2011): How to install OS X Server on a software RAID volume
Currently Being ModeratedMay 9, 2013 7:54 AM (in response to Sevver)
If apple knew your Apple ID when you bought the servers, and you registered those computers with the same Apple ID, then it will automatically know that you are entitled to three copies of the Server app.
However, this often doesn't happen right because they didn't match up the Apple ID on the purchase. So make sure you have your order number(s) for the three servers and phone Apple's support number for those sales (should be on the order acknowledgement) and they'll fix it for you over the internet.
Currently Being ModeratedJul 8, 2013 9:13 PM (in response to Sevver)
For what it's worth, I just setup a RAID1 volume per the support article, upon reinstalling OSX I did not have to enter in any Apple ID or password, it just started to install.