[PEN-TEST] MS Exchange 5.5 and Windows NT 4

["Skinner, Tim L." <Tskinner () LARSONALLEN COM>]

Hi all.

I am relatively to penetration testing, and I have come accross something
that I think I should be able to expolit, but can't figure out how.  I have
brute-forced the Administrator password on an NT server with Exchange 5.5
via the POP3 service.  This server is behind a firewall and only has ports
25 and 110 open on it.  Does anyone know of a way to use this information to
further compromise this host? or is this as far as someone could get?