libmsn is a C++ library for Microsoft's MSN Messenger service. It provides a
high-level interface that allows an application to access instant messaging
features with ease.

libmsn currently supports version 8 of the MSN Messenger protocol. This means
that it supports the following features:
   * Login and logout.
   * Buddy presence notifications.
   * Buddy list management.
   * Privacy settings.
   * Conversations.
   * Typing notifications.
   * File transfers.

WWW: http://libmsn.bdash.net.nz/