Firstly...the problem described below does not happen with Outlook2003. It is just Outlook2007 clients experiencing the problem.
I have Outlook2007 clients connected externally to the server and they can send and receive emails without problem. They connect using remote.domain.com which is a 3rd party certificate from godaddy pointing to the Exchange server on sbs2008. They all use exchange cache mode...
The error the Outlook2007 client receives is:
21:33:56 Microsoft Exchange offline address book
21:33:56 Not downloading Offline address book files. A server (URL) could not be located.
Any help what is causing this?