Windows Live Messenger

Windows Live Messenger for BlackBerry® smartphones allows you to chat in virtual real time with your instant messaging  IM  contacts when and where you want to, not just when you're in front of your computer.

Features:
-Fast and reliable messaging
-Virtual real-time awareness of which of your contacts are online and ready to chat
-The ability to customize your own status messages  e.g. ?Back in 5 mins  
-Access to your existing Windows Live Messenger Contact List and the ability to add, delete and block contacts
-Emoticons to express yourself
-Auto-login so you?re always connected
-The ability to participate in several chats at once and to initiate and participate in multi-user chats
-Communicate with other Windows Live Messenger users even while using other applications on your BlackBerry device
-New messages appearing directly in your BlackBerry smartphone Messages list

For all technical support with Windows Live Messenger, please visit http://us.blackberry.com/support/software/wlm.jsp
For billing issues and technical support options related to App World only, please visit http://www.blackberry.com/support/appworld. 
Direct support is unavailable through the “Contact Support” button.