Why I recommend you don’t leave POP and IMAP protocol logging enabled on Exchange Servers.
This tutorial demonstrates how to configure ISA Server 2006 publish POP3 and the alternate client mail submission port to allow Exchange 2010 mailbox access by remote email clients.
How to configure the Exchange Server 2010 POP3 client settings in Windows Live Mail, a free email client from Microsoft.
How to publish Exchange 2010 POP3 and SMTP server settings so that end users know how to configure their email client.
This Exchange Server 2010 tutorial demonstrates how to enable or disable POP3 access for individual mailbox users, and how to manage POP3 settings for multiple mailboxes at once.