You are the Exchange administrator for your company. The network consists of a single Active Directory domain.
The mixed-mode Exchange organization consists of two administrative groups named London and Paris. The company’s Paris site contains a computer that runs Exchange Server 5.5.
The London administrative group contains a computer named Mail1 that runs Exchange Server 5.5 and computer named Mail2 that runs Exchange 2000 server.
Mail2 fails and is replaced with a new computer named Mail2 that runs Exchange Server 2003. You create an SMTP connector on Mail3.
When you view the site configuration in the Exchange Administrator account on Mail1, you notice that the new SMTP connector is not shown.
You need to ensure that configuration changes on the Exchange server 2003 computers are replicated to the Exchange server 5.5 computers.
What should you do?

A.
Create a new site Replication service on Mail3.

B.
Replicate the system folders for the London administrative group to Mail3.

C.
Create a new Active Directory Connector (ADC) recipient connection agreement for the London site.

D.
Modify the directory replication connectors between the London and Paris sites to use Mail3 as the bridgehead server in the London site.

Explanation:
London administrative have two exchange servers one 5. 5 and one 2000, this means that
between exchange 5.5 and exchange 2000 exist one SRS service, because Exchange 2000
Server computer has the Site Replication Service (SRS) installed and running on it, you
must create a new SRS in Exchange System Manager, this role must be moved to the new
exchange 2003 to be able to see SMTP connector
References
XADM: How to Create an Additional Site Replication Service for a Mixed Site KB 255285
XADM: How to Change the Role of a Server Within a Routing Group KB 239556
XADM: How to Rebuild a Site Replication Service Without a Backup KB 282061