The only way the BES Admins can view the BBMessenger chats is to enable the monitoring of it on the BES. IIRC, the way it works is that the chats are emailed back to them. So, you would know if they were being monitored as you would have emails regarding it. Most BES Admins don't enable this feature. HOWEVER, PIN's and SMS, and obviously emails CAN be monitored easily without your knowledge.
But as posted above, I still wouldn't do anything on your work BlackBerry that would go against any company policy.
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