You have an Exchange Server 2007 environment. All users have mobile devices with Windows Mobile 6.0 installed. You need to allow users to securely synchronize e-mail and contact information without having to connect their mobile device to their client computer. What should you do?

A.
Configure the mobile devices to use IMAP4.

B.
Configure the mobile devices to use POP3.

C.
Configure Microsoft Office Outlook Web Access on the Exchange server.

D.
Configure the mobile devices to use Microsoft ActiveSync.