How does exchange 2003 with blackberry bis encryption work

I have exchange 2003 and some people are now using blackberries to read their emails.  They are using the blackberry information service (BIS) that comes with the phone from at&t.  My understanding is that the BIS keeps checking our exchange server for emails for that user, and if there is one, it gets it and sends it to the users phone.  There is no encryption installed on the exchange 2003 server like SSL, so how does the BIS  check the persons account without sending the user name and password in plaintext over the internet.  Or does it send that in plaintext over the internet.  Also, it doesn't encrypt the email itself, does it?  I could find any articles here or on the internet that address this, they mostly start refering to the Blackberry Enterprise server, which we don't have.
Can any body point me to any articles about these details (BIS and encryption)?
Thanks a lot,
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ALogvinConnect With a Mentor Commented:
"Email messages sent between the BlackBerry Internet Service and the BlackBerry Internet Service subscribers BlackBerry smartphone are not encrypted. When transmitted over the wireless network, the email messages are subject to the existing or available network security model(s).

When you log in to the BlackBerry Internet Service, the data is transmitted over a Secure Sockets Layer (SSL) connection."

I finally found the direct quote, so let me modify my answer from before. When you log into the web client to enter your username and password, it is a SSL connection, and is encypted. When the e-mails are forwarded to your device, they are not encypted.
E-mail between the BIS server and your Blackberry is encrypted, however typically users that dont have a BES use POP3 to access their mailboxes... and POP3 isnt very secure, as you mentioned. That is a big reason people purchase BES servers.
elmertAuthor Commented:
so does that mean the username and password between the pop3 server and BIS server are in plaintext?  
elmertAuthor Commented:
thanks, that helps a lot
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