You are the administrator of a Windows Essential Business Server 2008 environment. You are configuring the Messaging Server for mobile device users. You enable Exchange ActiveSync to allow mobile device users to access their e-mail remotely over a wireless network. A user named Adam is leaving your company. You want to disable the ActiveSync feature for Adam only.

Which cmdlet should you use?

A.
Set-ActiveSyncMailboxPolicy

B.
Set-Mailbox

C.
Set-MailUser

D.
Set-CASMailbox

Explanation:
You should use the Set-CASMailbox cmdlet. Exchange ActiveSync is an Exchange synchronization protocol that enables mobile device users to access their e-mail, calendar, contacts, and tasks, even while they are working offline. When you install the Client Access server role, Exchange ActiveSync is enabled by default. You can also manually enable or disable ActiveSync for a user or a group of users by using the Exchange Management Console or the Exchange Management Shell. You can run the Set-CASMailbox cmdlet from the Exchange Management Shell to enable or disable ActiveSync for a user or a group of users. The Set-CASMailbox cmdlet allows you to set client access-related attributes for Microsoft Exchange ActiveSync, Microsoft Office Outlook Web Access, Post Office Protocol version 3 (POP3), and Internet Message Access Protocol version 4 (IMAP4) for a specified user. You can also use the Set-ActiveSyncVirtualDirectory command to configure Exchange ActiveSync settings on a particular virtual directory. This can be useful when you want to enable mobile device users to access only specific virtual directories.
You should not use the Set-ActiveSyncMailboxPolicy cmdlet because this cmdlet cannot be used to enable or disable the ActiveSync feature for a user or a group of users. The Set-ActiveSyncMailboxPolicy cmdlet enables you to apply a variety of mailbox policy settings to a server. The Exchange ActiveSync mailbox policies are used to apply a common set of policies or security settings to a collection of users.

You should not use the Set-Mailbox cmdlet because this cmdlet cannot be used to enable or disable the ActiveSync feature for a user or a group of users. The Set-Mailbox cmdlet is used to modify the settings of an existing mailbox.

You should not use the Set-MailUser cmdiet because this cmdiet cannot be used to enable or disable the ActiveSync feature for a user or a group of users. The Set-MailUser cmdiet is used to modify the mail-related attributes of an existing user in the Active Directory service.