Blackberry Internet Service Encryption

We have a client using Blackberries and an Exchange 2003 Server.  They are synchronizing their e-mail w/ Exchange w/out the use of BES or any desktop software; they claim they just needed the username and password for their e-mail to make this work.  I have two questions:  Is this most likely being accomplished through the use of the Blackberry Internet Service provided by their provider?  If so, is there any encryption of the messages provided between Exchange and the device?

Fred Lockhart
czazDirector of Systems AdministrationAsked:
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First question: Yes

Second question: BIS Service is not encypted. If you want the advanced security features of a Blackberry to work (like encyption), you have to take advantage of a BlackBerry server.

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