IMTiger is a simple and very useful add-on that turns MSN Messenger into a multi-protocol client. IMTiger allows you to have one combined contact list for multiple accounts of MSN, ICQ and AIM.
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
[Via Neno Loje's Treasury ]