Mac Messenger is a client for the MSN instant messaging protocol. You can use it to chat with your friends who have MSN Messenger®. Mac Messenger is intended to be fast, stable, and easy to use, by Mac OS X AND Mac OS 8.x to 9.2.2 users!
What's new in Mac Messenger
New in version 3.5.4:
New gradient listbox style when selecting a contact.
New Tiger Unified Toolbar support (OS X Tiger only)