Windows Server 2012 R2

Certificate Services
Installing to usb drive
http://www.infotechguyz.com/WindowsServer2012/WindowsServer2012asHighlyAvailableNASAppliance.html
Convert to a workstations : http://www.win2012workstation.com/
Quotas for disk space in Windows
https://support.managed.com/kb/a1810/windows-server-2012-has-one-rdp-session-by-default.aspx
Reset Domain Administrator password - http://www.top-password.com/knowledge/change-domain-administrator-password.html