That's strange... removing the GUI was supposedly a way to reduce attack surface and resources overhead in a server accessed from a distance. And now I see a system that not only ha a GUI, but a windowed one, with COMMAND PROMPTS in said windows!
That's walking on your head! the reason people use the command line to configure a server is because it allows easy, secure and fast access to a remote computer (something this system doesn't allow, since you need to use Terminal Server, serving a GUI containing emulated terminals), but also because a 'core' OS shouldn't have to serve data to the graphical hardware when it's not in use!
Let's see: a working Linux kernel is 3-5 Mb in RAM; add init and bash (I won't go into the BusyBox domain), you have a 'core' OS fitting in less than Mb. Now, add Samba (for ActiveDirectoy): 8 Mb more, loading from (compressed) disk image of less than 20 Mb. There, you've equaled Windows Server 2008 Core, its 200 Mb of RAM and 5 Gb of disk space.
Now, add a capable text editor: vim or emacs, or a text-based GUI: Midnight Commander. Any of these make notepad look ridiculous; editing config files through vim or emacs, with syntax highlighting, makes the MMC clunky and awkward to use.
Add a MySQL or Oracle or PostGreSQL server, Apache 2 + PHP, and hatever extra service you need, and you have a multirole server you can access through a tunneled, SSH encrypted, terminal window as if you were working right on it. Footprint is less than a Gb (make that, less than 300 Mb on an uncompressed file system).
And last, you can even install an X client on the server, and connect to it from a distance without hardware overhead on the server - because it's your local machine's X server that accesses your local hardware (and when the session stops, whatever 'graphical' stuff the server has loaded, is unloaded: graphical driver included).
So, while GNU/Linux, xBSD and Solaris allow minimal OS overhead on any server and any way you may use to access it, Windows Server 2008 has graphical overhead over the kernel, and adds terminal emulation on top of a graphical overhead.
Walking on your head seems to be a Microsoft motto these days.