The Wayback Machine - https://web.archive.org/web/20120101062505/http://www.codeguru.com:80/cpp/i-n/network/messaging/

    Messaging

    Clients that Find Servers in a Windows Network Domain (TCP/IP, Mailslot)

    Learn how to use a mailslot to broadcast information over a network.

    Creating a Chat System

    Create a Chat System (Client and Server) to chat either on a LAN or the Internet.

    Open Source Messenger for Any Version of Windows

    Build an open source messenger that works with nearly any version of Windows.

    Using MAPI to Send E-Mail

    How to send customized e-mail messages and attachments programmatically using MAPI.

    Peer to Peer Network Messenger

    This program is a peer to peer messenger program which functions (and looks) like MSN messenger. since this program is peer to peer there is no hidden server code, it's all here!

    Adding More Privacy to Users of Existing Messengers

    SQLProxy is a program created for adding more privacy to users of existing messengers. In this first versions, only Yahoo! messenger protocol is supported.

    Send - Messenger Service Pair

    Send - Messenger Service Pair

    Open Source Chat Program

    Complete, realtime chat application (source code included!)

    Simple Messaging Service

    Simple Messaging Service

    Sending "Pop Up" Messages via NetMessageXXX Functions

    Sending "Pop Up" Messages via NetMessageXXX Functions