From IMTiger Software:
IMTiger is a powerful adds-on for MSN Messenger. It turn MSN Messenger into a multi-protocol client. With IMTiger, your AIM/ICQ buddy would be listed in MSN Messenger's contact list and you can talk with them. IMTiger features support unlimited number of MSN/AIM/ICQ account in one MSN messenger. Turn your MSN Messenger into a multi-protocol client. List AIM/ICQ buddy's present status in MSN Messenger's contact list. Chat with AIM/ICQ buddy in MSN Messenger. Break MSN's contacts number limit. Version 0.4 may include unspecified updates, enhancements, or bug fixes.