NDES in 2008

[Neil]

Hi
I am trying to setup Certificate Services on Server 2008 with Network
Device Enrollment Service (implementation of SCEP).
NDES uses 2 certificate's to run the service
1. CEP Encryption
2. Exchange Enrollment Agent (Offline request)

I want to duplicate these certificate templates to give the certificates a
longer lifetime.
When NDES is installed the 'Exchange Enrollment Agent (Offline request)'
certificate is installed in the local Computer store.

As far as I can tell the 'Exchange Enrollment Agent (Offline request)'
certificate can only be issued to users so how do I enroll for my V2
duplicate 'Exchange Enrollment Agent (Offline request)' certificate so it is
created in the local computer certificate store?