You administer Microsoft Exchange Online for Fabrikam, Inc. Fabrikam’s Exchange Online tenant domain
name is fabrikam.onmicrosoft.com.
You verify the domain fabrikam.com in the Office 365 admin center and instruct other administrators to
configure new Exchange Online users with fabrikam.com as the primary SMTP domain. The fabrikam.com
domain is not federated.
A user reports that his reply-to address is displayed to external email message recipients as
User1@fabrikam.onmicrosoft.com.
You need to configure the user’s mailbox to meet the following requirements:
The user’s reply-to address must be User1@fabrikam.com.
The email address User1@fabrikam.onmicrosoft.com must function as a secondary email address for the
user.
Which Windows PowerShell command should you run?

A.
Set MsolUser –UserPrincipalName User1@fabrikam.onmicrosoft.com -AlternateEmailAddresses
user1@fabrikam.com

B.
Set-Mailbox -Identity user1@fabrikam.onmicrosoft.com -ForwardingAddress “User 1”

C.
Set-Mailbox -Identity user1@fabrikam.onmicrosoft.com –WindowsEmailAddress User1@fabrikam.com

D.
Set-Mailbox -Identity user1@fabrikam.onmicrosoft.com -EmailAddresses
user1@fabrikam.onmicrosoft.com, user1@fabrikam.com

Explanation:
The PowerShell cmdlet:
Set-Mailbox -Identity user1@fabrikam.onmicrosoft.com –WindowsEmailAddress User1@fabrikam.com
will change the user’s primary email address to User1@fabrikam.com. The user1@fabrikam.onmicrosoft.com
email address will continue to function as a secondary email address.
http://community.office365.com/en-us/f/158/t/20809.aspx