Your network contains an Active Directory forest. The forest contains two sites named Montreal and
New York.
You have an Exchange Server 2013 organization that contains a Mailbox server and a Client Access
server in each site.
The users in the New York site report that the offline address book (OAB) is not updated after an
extended WAN outage between the sites.
The Montreal site contains the OAB generation server.
You need to ensure that the New York site users download the OAB from a server in the New York
site.
Which two cmdlets should you run? (Each correct answer presents part of the solution. Choose two.)

A.
Set-Mailbox
B.
New-OfflineAddressBook
C.
New-Mailbox
D.
New-OabVirtualDirectory
E.
Set-OfflineAddressBook
Incorrect, New-mailbox has no need to be here. If anything Its B&E I think.
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I think you may be wrong. Check out the bit for creating new organization mailboxes for geographically disbursed areas.
https://blogs.technet.microsoft.com/exchange/2013/01/14/managing-oab-in-exchange-server-2013/
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The provided answer is right:
Exchange Server 2013 CAS role proxies the OAB download request to a “nearest” mailbox server
hosting an active Organization Mailbox.
Both Montreal and New York host a mailbox server and a client access server.
Therefore you need to create a new active Organization Mailbox
Administrators can create additional Organization Mailboxes for fault tolerance or for serving users
in a geographically disbursed Exchange deployment.
Creating a new Organization Mailbox is a two step process:
Step1: Create a new arbitration mailbox
New-Mailbox -Arbitration -Name “OAB Seattle” -Database DB2Seattle -UserPrincipalName
oabs@contoso.com –DisplayName “OAB Mailbox for Seattle”
Step2: Enable OABGen capability
Set-Mailbox -Arbitration oabs -OABGen $true
http://blogs.technet.com/b/exchange/archive/2013/01/14/managing-oab-in-exchange-server-
2013.aspx
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To provide close proximity to an OAB generation mailbox in a distributed environment, you
can create additional arbitration mailboxes as needed. When creating an arbitration mailbox,
specify the Arbitration parameter to the New-Mailbox cmdlet. After creating an arbitration
mailbox in the desired location, enable OAB generation by using the –OABGen $True param-
eter with the Set-Mailbox cmdlet.
Exam Ref. 70-341 , Objective 1.2: Configure and manage the mailbox role CHAPTER 1 27
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When an OAB download request is received by a client access server, it proxies the request
to the mailbox server hosting an active arbitration mailbox in the same Active Directory site.
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