I'm a new BlackBerry user. One of the first thing I wanted to try was the IM services. I tried many software, but in my opinion the best one is "Quick IM". I council to try Quick IM if you have not still made it. You can find it at:

Translation: QuickIM Mobile MSN Instant Messenger for PDA and cell phones, MSN AOL Yahoo Compatible: Palm Treo 600 650 LifeDrive TX Tungsten C, BlackBerry, Nokia 9500 9300, SonyEricsson P900, P910, P990, Motorola A1000 ...

This program is only for MSN Instant Messaging.