How To Remove Blackberry Messenger From OS 6

 

1. Install BlackBerry App World (if you don’t have it already)
2. Open BlackBerry App World
3. Select and click the magnifying glass icon
4. Type in MESSENGER
5. Select and click BlackBerry Messenger
6. Click INSTALL
7. Select YES to replacing the current version
8. Reboot the phone when prompted
9. Go to the Application Management menu (Options—>Device->Application Management)
10. Select and click BlackBerry Messenger
11. Click DELETE
12. Reboot the phone when prompted
13. After reboot go to App World->My World
14. Hold the ALT button and type RST which will clear the App World cache

 

Source:
http://retrohack.com/how-to-delete-blackberry-messenger-from-blackberry-os-5-0/
http://my.blackberry.com/thread/1561