The Exchange Management Shell gives you a powerful command-line interface for administering Exchange 2007. You can use the Exchange Management Shell to manage the POP3 and IMAP4 services and your POP3 and IMAP4 users.

Managing POP3 and IMAP4 on a Client Access Server

Managing POP3 and IMAP4 Settings on a Per-User Basis

When you deploy Client Access servers to support clients that use POP3 and IMAP4 and their mailboxes are located on Exchange Server 2003 back-end servers, you must use Basic authentication, and you will be unable to use Secure Sockets Layer (SSL) encryption. Instead, you must use Internet Protocol Security (IPsec) to help secure the communication between these servers.

You cannot use the Anonymous account or Guest account to log on to an Exchange 2007 mailbox through POP3 or IMAP4. This kind of access is blocked because of security vulnerabilities when you use non-standard accounts for POP3 and IMAP4 access. Additionally, you cannot connect to the Administrator mailbox through POP3 or IMAP4. This behavior is by design in Exchange 2007 to enhance security for the Administrator mailbox. To access the Administrator mailbox, you must use Microsoft Office Outlook or Outlook Web Access. For more information, see Administrator Cannot Connect to the Administrator Mailbox Using POP3 or IMAP4.

• For more information about how to use the Exchange Management Shell, see Using the Exchange Management Shell.
  
• For more information about how to use the Exchange Management Shell to administer POP3 and IMAP4, see POP3 and IMAP4 Cmdlets.