Currently Being ModeratedFeb 2, 2013 9:35 PM (in response to legoman4489)
As far as I know this isn't possible.
You can turn off all services but I dont think you can remove the server part of your OS.
At least there is no simple way to do so.
Currently Being ModeratedFeb 4, 2013 9:40 AM (in response to legoman4489)
Assuming you are referring to Mac OS X Server app for Mountain Lion, just drag the application into the trash and delete it.
Dragging Server.app out of the Applications folder will cause it to automatically self-disable all server functionality.