You are a messaging professional. Your company uses a Microsoft Exchange

Server 5.5 messaging system. The company has deployed a single Microsoft Active Directory forest.

The company has a main office and four branch offices. Each office includes an Exchange Server 5.5 site

and at least one Exchange Server 5.5 computer. Users in each office access their mailboxes by using

Microsoft Office Outlook 2003.

The company plans to migrate all the messaging services to a Microsoft Exchange Server 2007

environment. All the Exchange Server 2007 computers will be deployed in the data center at the main

office. The migration is expected to take three months.

Your company has the following requirements:

The messaging services are not to be disrupted during the migration.

The Office Outlook 2003 profiles of users are to be reconfigured.

You need to design a migration plan to meet the outlined requirements.

What should you do to design a migration plan to meet the outlined requirements?

A.
Implement a new Exchange Server 2007 organization. Install the Exchange Server 2007 computers at the
main office and move the existing mailboxes to the new computers.

B.
In each office, install a Microsoft Exchange Server 2003 computer. Move all mailboxes to the Exchange
Server 2003 computer. Decommission the Exchange Server 5.5 computers. Install the Exchange Server 2007
computers at each office and move the existing mailboxes to the new computers.

C.
In each office, install a Microsoft Exchange Server 2003 computer. Move all mailboxes to the Exchange
Server 2003 computers. Decommission the Exchange Server 5.5 computers. Install the Exchange Server 2007
computers at the main office and move the existing mailboxes to the new computers.

D.
In each office, install a Microsoft Exchange Server 2003 computer. Move all mailboxes to the Exchange
Server 2003 computers. Decommission the Exchange Server 5.5 computers. Implement a new Exchange Server
2007 organization. Install the Exchange Server 2007 computers at the main office and move the existing
mailboxes to the new computers.