Share via

How to Configure IMAP4 Access to Exchange 2003 Servers

Microsoft Exchange Server 2007 will reach end of support on April 11, 2017. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.


Applies to: Exchange Server 2007, Exchange Server 2007 SP1, Exchange Server 2007 SP2, Exchange Server 2007 SP3

This topic explains how to use the Exchange Management Shell to configure connectivity options for connecting to Microsoft Exchange Server 2003 servers for Internet Message Access Protocol version 4rev1 (IMAP4) access. By using the settings for this cmdlet, you can specify the port to use to connect Microsoft Exchange Server 2007 servers that have the Client Access server role installed to Exchange 2003 servers. By default, this value should be set to use port 143. This cmdlet also lets you disable access to Exchange 2003 servers.


After you have configured IMAP4 access to Exchange 2003, you must restart the IMAP4 service. For more information about how to restart the IMAP4 service, see How to Start and Stop the IMAP4 Service.

Before You Begin

You can configure Exchange 2007 Client Access servers to connect to mailboxes located on Exchange 2003 servers. However, when you do this, you must disable Secure Sockets Layer (SSL) encryption and enable Basic authentication on the Exchange 2003 server. Because the user name and password are sent in clear text when Basic authentication is used without encryption, we recommended that you secure the traffic between the Client Access server and Exchange Server 2003 server by using Internet Protocol security (IPsec).

To perform the following procedures on a computer that has the IMAP4 service enabled, the account you use must be delegated the Exchange Server Administrator role and membership in the local Administrators group for the target server.

For more information about permissions, delegating roles, and the rights that are required to administer Exchange Server 2007, see Permission Considerations.


To use the Exchange Management Shell to configure IMAP4 access to Exchange 2003 servers

  1. To configure IMAP4 access to Exchange 2003 servers by using the default port value, run the following command:

    Set-ImapSettings -ProxyTargetPort 143
  2. To disable IMAP4 access to Exchange 2003 servers, run the following command:

    Set-ImapSettings -ProxyTargetPort 0

For more information about syntax and parameters, see Set-IMAPSettings.

For More Information

For more information about how to use IMAP4 with Exchange 2007, see the following topics: