So I see I can purchase macOS Server in the Mac App Store for about £20. This is all well and good, but very different to the way things used to work.
By purchasing the server app on the app store, do I get all of the features of the old server OS, for example Mac OS X Server 10.5, or does it only add a few features?
Is this a set of server management tools, or does it convert my client OS into a full server OS?
Can I use it on multiple machines simultaneously. If not, can I install it more than once (if I do not use it on multiple installations simultaneously)?
Is it a one-time-payment for all updates to the server OS?
is it limited to a certain amount of installs before I have to purchase it again?