04-17-2012 09:24 AM
In the past few days have you upgraded your AIM, Yahoo or Live Messenger?
If so, go to Options > Advanced > Applications and delete the one or more messenger apps you upgraded.
Your Address Book will work again.
This is a known glitch with RIM, I have heard they are investigating a fix.
PIN: C0001B7B4 Display/Scan Bar Code
PIN: C0005A9AA Display/Scan Bar Code