Quote from new.cnet.com :
The announcement comes just days after Saudi Arabia's neighbor, the United Arab Emirates, announced it would block e-mail, instant messaging, and Web browsing on BlackBerry devices starting October 11 if it fails to reach an agreement with RIM to bring BlackBerry services in the region in line with UAE telecommunications regulations. The UAE has complained that the security used to encrypt the BlackBerry data violates its regulations and prevents it from monitoring such data in the name of national security.
Read more...
Other related articles:
1. How Blackberry works?
"Unlike the Apple/Nokia mobiles who uses open standards, BlackBerry uses a highly secured and proprietary data transmission mechanism. Every piece of information that leaves a BlackBerry phone is encrypted and it can only be decrypted by the BlackBerry network data center in Canada. This means that no one can actually understand the encrypted message that travel through the wireless networks and internet."
