I'm very confused about installing the Exchange agent...

My backup server is running NT with BENT 8.5 / auto loader etc and and I
have 2 remote servers getting backup up.
All that is working fine.

I also have a Win2k machine running exchange 2000 in its own domain.
I have the remote agent for Exchange 2000 but am very confused as to how to
install it.
When I choose to install agents on remote server it is not listed?!!!
Any ideas?

Also from the documentation it states

"For Exchange 2000 the backup server must be running Windows 2000"

Is this true...???