
18 1.3 RAMS
that sometimes you had to define sites for routing reasons, for network
topology reasons, or for directory replication reasons. Indeed, the behavior
of the mail flow or the directory replication flow in Exchange 5.5 is very
much dependent on the actual site topology.
With Exchange 2000, and today with Exchange 2003, the administra-
tion model can have far more granularity by controlling the exact set of
rights or permissions that a particular Windows 2000 user (or security prin-
cipal, which encompasses security groups) can have on a given container or
object. Furthermore, servers and services are not arranged anymore by
“sites” but rather by ...