Service logon credentails for 'Client for NFS' service

On Windows 2003, SFU 3.5:

In SFU 3.5, the default logon type is ‘local system’. We can however change the service logon type to “domain admin” credentials. The service still works.

On Windows 2003 R2:

The ‘client for NFS’ service logon type is designed to run with the local system account. Changing the “client for NFS’ service logon type from local system account to domain admin credentials, will not work and also not supported scenario.   

 On Windows 2008 R2:

The “Client for NFS” service is designed to run with the “Network Service” account name. Changing it to some other credential, will not work.