Currently Being ModeratedFeb 6, 2013 7:54 AM (in response to pa_golfer)
To uninstall Mac OS X Server for Mountain Lion, simply remove Server.app from the Applications folder.
This will cause it to shutdown and uninstall all the server pieces.
Currently Being ModeratedJul 30, 2013 2:42 PM (in response to pa_golfer)
Turn off all services.
Drag Applications/Server to the Trash.
An alert will ask if you want to remove Server. Say yes.
Drag Library/Server to the Trash.
Currently Being ModeratedJul 31, 2013 9:37 AM (in response to pa_golfer)
If you just want to reinstall Server.app from scratch, then issue this command in Terminal:
sudo rm /var/db/.ServerSetupDone
Now when you launch Server.app, it'll go through the install wizard again.