All I can say: Google, here I come. And with it a good part of my ecosystem.
...but I guess that's the point that Apple is acknowledging: if you want email and web services for a small business, Google, Office 365 etc. - or even a VPS account if you're a power user - where your data gets hosted on a professionally maintained cloud of servers with top-tier internet connections is the tool for the job, nowadays. Especially when you have to support employees with home PCs, iDevices, Androids etc., run industrial-strength spam blocking, set up
SPF/DKIM etc.
I resent being forced to subscribe to cloud services to run applications that don't even need the internet, and have those apps go down when the internet is down - but when we're talking about services that rely on the
anyway that's not so relevant.
The security/availability of cloud services is probably significantly better than you'll achieve via DIY - its a bit like keeping a stack of gold under your bed because you don't trust the banks to keep your money safe...
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I don't understand too much in server software, but isn't this essential to schools and universities where Apple supposedly care about the education market?
Schools and universities are increasingly outsourcing their mail and web services to Google, Office365 etc. and even before that they were more likely to run Unix- or Windows-based systems for their key services than Mac servers - even if many staff use Macs. Today's MacOS can work -
has to work - with industry/de-facto standard services.
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Sigh. Apple Push Notifications (APN) as mentioned above and as already mentioned by me
here.
...which (according to the article you linked to)
can be implemented with open source software, but need some certificates only shipped with MacOS server (which existing users will have). Maybe Apple will provide a way of getting these (obviously a mechanism exists for 3rd party iOS App developers who implement push messages).
There goes the power user
No, the power user has already got fed up with the limitations of trying to configure complex services with a point'n'drool interface, installed macports or homebrew and replaced the out-of-date versions of the standard server applications supplied with MacOS.