You are the messaging engineer for your company. The company has one main office and 100 branch offices. An Active Directory site exists for each office. The company has a Microsoft Exchange Server 2003 messaging system. Each office contains one Exchange server. A routing group is configured for each office. You plan to transition the companys messaging system to Exchange Server 2007. You need to design a transition plan that allows both versions of Exchange to coexist. Your plan must also minimize the number of servers deployed in your Exchange organization. What should you recommend?
A.
Install an Exchange Server 2007 Mailbox server in all offices. Move all mailboxes and replicate all public folders from the Exchange Server 2003 server to the new Mailbox server. Decommission all Exchange Server 2003 servers.
B.
Install an Exchange Server 2007 Mailbox server in the main office. Move all mailboxes and replicate all public folders from the Exchange Server 2003 servers to the new Mailbox server. Decommission all Exchange Server 2003 servers.
C.
Install an Exchange Server 2007 Mailbox server, a Client Access server, and a Hub Transport server in all offices. Move all mailboxes and replicate all public folders from the Exchange Server 2003 server to the new Mailbox server. Decommission all Exchange Server 2003 servers.
D.
Install an Exchange Server 2007 Mailbox server, a Client Access server, and a Hub Transport server in the main office. Move all mailboxes and replicate all public folders from the Exchange Server 2003 server to the new Mailbox server. Decommission all Exchange Server 2003 servers.
Explanation:
At minimum, a Hub server must be installed at each site with a 2007 Mailbox server, Choices A and B eliminated.There are numerous benefits to running Exchange 2007 on 64-bit hardware, the biggest of which is scalability. Obviously, having a machine with more memory and faster performance will allow you to add more users to the Exchange server. If youre running a medium to large organization, most likely youve already forked out a large sum for a fast iSCSI or Fibre Channel SAN. While youll still need a SAN for storage, the increased memory available to 64-bit architecture will reduce disk I/O dramatically. Testing shows a reduction in I/Op/s of roughly 70% for 2007 over 2003, on the same hardware.
The 64-bit architecture also makes available a greater number of storage groups and databases. Exchange 2007 accommodates 50 storage groups with 50 databases. Increased memory capacity allows more of the database to be held in RAM. Reducing disk I/O and the increased number of connections permits you to incorporate more users in your organization without needing additional servers.
In a nutshell, 64-bit Exchange enables:
1. Greater message volume.
2. Larger message size.
3. Larger attachment size.
4. More users per server.
5. Increased client (OWA, OMA, RPC, ActiveSync) connections.
http://www.msexchange.org/tutorials/why-64-bit-good-e12.html#