Do Exchange 2007 Public Folders have URL's, as did the Exchange 2003 Public Folders? If that's the case, configure http authentication on the MDS Connection service and distribute the folder's URL link to their BlackBerry Browsers and see what happens.
Doesn't work in every environment because of RIM's inability to support NTLM <v2, but if you were able to get BB's to see network folders, sounds like there's a good chance this will work too.
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