Your network contains an Exchange Server 2010 Service Pack 1 (SP1) organization named
contoso.com. The organization contains a Client Access server named Server1.contoso.com
and a domain controller named dcl.contoso.com.
You need to modify the external host name for Outlook Anywhere.
What should you do?

A.
Run the Set-OfflineAddressBook cmdlet.

B.
Run the Export-ExchangeCertificate cmdlet.

C.
Modify the Redirect.aspx file.

D.
Modify the Casredirect.aspx file.

E.
Modify the properties of the Client Access server object.

F.
Modify the properties of the offline address book (OAB) virtual directory.

G.
Run the Set-ImapSettings cmdlet.

H.
Modify the properties of the Exchange ActiveSync virtual directory.

I.
Run the Set-PopSettings cmdlet.

J.
Modify the properties of the OWA virtual directory.
K.
Run the New-ActiveSyncMailboxPolicy cmdlet.
L.
Run the New-OwaMailboxPolicy cmdlet.

Explanation:

http://technet.microsoft.com/en-us/library/aa996902.aspx