For you and other administrators in your organization to
configure and manage Instant Messaging Service, you must have the
To manage Instant Messaging users, you must be a member of the
Domain Administrators security group for the domain that hosts the
To manage global Instant Messaging settings, such as firewall
topology, proxy server configuration, and any Instant Messaging
home servers and routers in your organization, you must also be a
member of the Exchange Administrators security group.