Short description of Native POP3 Connector 2.4.6: Native POP3 Connector (NPC) offers a standard solution for the problem with receiving mail through the POP3 protocol for Microsoft Exchange Server 2000/2003 and Small Business Server 2000/2003. NPC is a standard solution for Microsoft Exchange Server: Connector. Features: administration through Exchange System Manager; flexible scheduler; AD integration and support; audit through Event Log; large number of mailboxes (including catchall).