@ Dawg & dmiller, i get the same message, i found this
From Blackberry.com
Before downloading Windows® Live Messenger for your BlackBerry® smartphone, check to see that you meet the below requirements:
Smartphones supported: BlackBerry® 7130e, BlackBerry® 7250 and BlackBerry® 8703e from Bell Mobility, BlackBerry® 8800 from T-Mobile USA.
BlackBerry.com