You are the Exchange administrator for your company.
The Exchange organization consists of four administrative groups. Each group contains only Exchange Server 2003 computers.
Each administrative group contains a single routing group, which connects to other routing groups by using routing group connectors.
The administrative group named London is upgraded from an Exchange Server 5.5 site. This administrative group contains two Exchange Server 2003 computers named Mail1 and Mail2.
Mail1 was the first Exchange server 2003 computer installed into the administrative group. It is used as mailbox server.
There are no user-created public folders on Mail1. All connectors in the routing group use only Mail2 as a bridgehead server.
Mail is configured 2 as the routing group master.
Mail1 cannot support the required workload. You add a new Exchange Server 2003 computer named Mail3 into the London administrative group.
Mail3 will perform all tasks that are currently performed by Mail1. You move all mailboxes from Mail1 to Mail3.
You need to ensure that you can remove Mail1 from the London administrative group without disrupting Exchange services.
Which three actions; should you perform? (Each correct answer presents part of the solution. Choose three.)

A.
Replicate the Offline Address Book folder and the OAB version 2 folder to Mail3, Remove the original replica.

B.
Replicate the schedule+ Free Busy folder to Mail3. Remove the original replica.

C.
Modify the Recipient update service to use Mail3.

D.
Create an instance of the site Replication Service on Mail3. Remove the original instance.

E.
Configure the London routing group to designate Mail3 as the routing group master.

F.
Configure all the routing group connectors in the London routing group to use Mail3 as the bridgehead server.

Explanation:
Explanation for ABC
Organization has updated from Exchange 5.5 to Exchange 2003 server, which mean that
A.B.C.D.E. had been done already during the update process. Right now we only want to
move to a different Exchange 2003 server. Remember that D.E. are only necessary when
you migrate or co-exist Exchange 5.5 with Exchange 2003 in your organization.
However you no longer has any Exchange 5.5 server in your organization. So what you
have to do now is to only proceed with A.B.C!
Explanation 2 for ABC:
Compare with the previous to question. This time they told us that Mail2 is configured as the routing group master and in this
case we need to move any service in Mail1 to Mail3. Mail1 was the first Exchange Server 2003 computer installed
into the administrative group, for this reason this server will be will have the Site Replication Service on it no the master routing
group.