Can Receive Emails on Blackberry w/Exchange 2007

We've recently installed Exchange 2007 and moved all our mailboxes over from 2003 except for a few.
The exceptions are the users who have Blackberries. We do not run the blackberry server, we maintain ours thru their website since we only have a few.
Inside the web site we currently have the and tried changing it to the new exchange box by but receive and error the mailbox can not be reached.
How do you configure either the blackberries or the exchange box without purchasing the server software?
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DFCRJAuthor Commented:
that will do it everytime.
BlackBerry Internet Service 2.x supports up to Microsoft Outlook Web Access 2007.
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