Your network contains an Exchange Server 2010 SP1 organization named contoso.com. The organization contains a Client Access server named Server1 and a domain controller named DC1.

You need to ensure that users who have a Windows Phone 7 device can connect to the Exchange organization by using the mail.contoso.com host name. The solution must ensure that all of the Windows Phone 7 devices can use the Autodiscover service.

What should you do?

A.
Modify the Casredirect.aspx file.

B.
Run the Export-ExchangeCertificate cmdlet.

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

D.
Run the Set-OfflineAddressBook cmdlet.

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

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

G.
Run the Set-PopSettings cmdlet.

H.
Modify the properties of the OWA virtual directory.

I.
Run the New-OwaMailboxPolicy cmdlet.

J.
Run the Set-ImapSettings cmdlet.
K.
Modify the Redirect.aspx file.

Explanation:
Under the Server Configuration -> Client Access -> Exchange ActiveSync node you can change the Microsoft Server ActiveSync (Default Web Site) Properties. In here you can modify both the Internal and External Exchange ActiveSync URLs.