You are a messaging professional. Your company uses an Exchange Server
environment that includes Microsoft Exchange Server 5.5 computers and Microsoft Exchange 2000
Server computers in a single Exchange organization.

The company has deployed a single Microsoft Active Directory forest. All domain controllers run
Microsoft Windows Server 2003.

The company has 5,000 employees. The company decides to migrate all the mail servers to a Microsoft
Exchange Server 2007 environment.

You need to ensure successful migration of all the mail servers to the Exchange Server 2007 environment
without reconfiguring user profiles.

What should you do?

A.
Decommission the Exchange Server 5.5 computers and upgrade the Exchange organization to Exchange
Server 2007 computers.

B.
Create a new organization for the Exchange Server 2007 computers and migrate the existing mailboxes into
the new organization.

C.
Run the adprep /forestprep command from the Windows Server 2003 installation CD on the server
configured as the Schema Master server.

D.
Run a script to register the Service Principal Name (SPN) of the computer accounts of each of the existing
Exchange Server 5.5 computers in the Active Directory domain.