NDES is not the first implementation of SCEP for Microsoft CAs. SCEP has previously been implemented as an add-on service for both Microsoft Windows 2000 Server and Windows Server 2003. NDES is the first native implementation of SCEP for a Microsoft CA, that is introduced in Windows Server 2008 and later server operating systems.


There are several changes in features in NDES that were not available in previous Microsoft implementations of SCEP: