Re: Yes, I notice Apple's Server OS wherever I look
Tell me, is ignorance really bliss?
OS X is, at bottom, a BSD UNIX derivative. Now, windows people may not know this: a UNIX "server" is created just by adding some extra software if it is not already there, free or bought and doing the configuration for the service you want to provide. You may want to tweak some system parameters to suit a different load mixture and you may want to increase memory or upgrade the network interface or something (or even decrease, many servers actually are not that busy compared with a graphics development workstation, for instance). But the day you get hold of a UNIX box, including OS X, you got a basic server platform.
So, my ancient, white MacBook already acts as a disc server to my windows machine and has got enough of the LAMP stack installed by default (just enable it) to act as a web server if I chose to use the laptop as a server. I could configure Postfix or install some other MTA to make it an email server; it can act as a print server the way it is. Of course, being an ancient laptop, the number of clients it could serve is rather limited and I would have to treat it more like a desk-top machine, i.e. leave it on, on the network. But, here it is, a server, even running LDAP (OS X uses it as standard).
Before you rattle on about hardware quality: do look at what people buy for servers: cheap Dells, do-it-yourself kits plus Slackware (really, I had to support such stuff in a "serious" firm relying on IT for their core business).