You have an Exchange Server 2010 server that has the Mailbox, Hub Transport, and Client Access server roles installed.

You need to ensure that users can send and receive email by using Windows Live Mail or Microsoft Outlook Express.

What should you do on the server?

A.
Install and then configure the SMTP server feature.

B.
Start the Microsoft Exchange POP3 service and then set the startup type to Automatic.

C.
Modify the properties of the MSExchangePOP3 (TCP-in) Windows Firewall rule.

D.
Modify the properties of the MSExchangeMailSubmission – RPC (TCP-in) Windows Firewall rule.

Explanation:
By default, POP3 is set to manual.