According to BlackBerry Forums Super Moderator, jibi, Research in Motion will start implementing native instant messaging clients for MSN Messenger, AIM, and ICQ quite possibly by the end of the year.
It appears most of these are almost final, and carrier implementation should start at some point (likely before year end). I’m going to guess that the MSN client is released first, followed by the AIM and ICQ clients (these should be released at the same time).
Lets just say that these native clients are long over due. Yahoo Messenger and Google Talk have been available for some time.