This document focuses on two key areas: A comparison of the POP3 service in Microsoft Windows Server 2003 and the POP3 service in Microsoft Exchange Server 2003 and an explanation of Windows Server 2003 POP3 service and Exchange Server 2003 coexistence.
Comparing the POP3 Service and Configuring Coexistence
Comparing the POP3 Service and Configuring Coexistence