You are a messaging professional for a company named Contoso, Ltd.

Contoso has a Microsoft Exchange Server 2003 messaging system. The company adds Microsoft Exchange Server 2007 Mailbox servers to its existing messaging system.

Contoso acquires another company named A. Datum Corporation. A. Datum uses an Exchange Server 2003 messaging system. A. Datum adds an Exchange Server 2007 Mailbox server to its messaging system.

Contoso and A. Datum will maintain their separate Microsoft Active Directory forests and Exchange Server messaging systems.

All the client computers in both the companies run Microsoft Office Outlook 2007 as their messaging client.

Users from Contoso and A. Datum must be able to view each other’s availability information and meeting details.

You need to implement a solution that meets the requirement. You also need to maintain the highest level of security between the forests.

Which two actions should you perform to maintain the highest level of security between the forests? (Each correct answer presents part of the solution. Choose two.)

A.
Configure the availability service in each forest for cross-forest access.

B.
Create an Active Directory cross-forest trust. Implement directory synchronization between the two forests
by using an account that has the necessary rights in each forest.

C.
Create an account that has the necessary rights in each Active Directory forest. Implement directory
synchronization between the two forests by using each account to access the directory in the other forest.

D.
Implement the Interorg Replication utility on an Exchange Server 2003 computer to replicate the free/busy
public folders between the two forests.