i asked the above question to a guy on another forum, his reply was, "Exchange 2007 - my provider is Sherweb. Very reliable, excellent service, and cheap. "
He says he cannot see subfolders in exchange 2007. Therefore he is lying (very doubtful) he is telling the trut His provider has not got exchange setup correctly (very doubtful) Or the n900 does not support exchange 2007 fully.