Client Version: 1.12
If you are looking for the classic version of WIM it can be found here
WIM (WoW Instant Messenger) is a World of Warcraft addon which brings an instant messenger feel to communication in game.
A modified 1.12 WIM which adds an option to ignore whispers from <lvl5, a fix for Kronos’ broken /who and a better method to collect /who data which works also when you get multiple whispers in short time, as well as some other minor fixes
The Git Repository for this addon can be found Here