If you want to enable either of those protocols, you must do the following:
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Enable the Windows IMAP4 or POP3 service on those cluster nodes that will be running the Exchange Virtual Server with the IMAP4 or POP3 resource. To make sure that the service works correctly with clustering, you must also configure the service to start manually.
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Manually add the respective IMAP4 or POP3 virtual server as a resource to each Exchange Virtual Server on which you want to enable the selected protocol, and then bring the resource online. For detailed steps, see the procedure below.
Before you start managing your Exchange cluster, you may want to review what constitutes an Exchange Virtual Server and its associated Exchange resources. You may also want to become more familiar with Cluster Administrator—the primary tool used to configure and manage clusters.
Also, make sure that you are familiar with "Using Server Clustering" in Planning an Exchange Server 2003 Messaging System and with "Deploying Exchange 2003 in a Cluster" in the Exchange Server 2003 Deployment Guide.