Exchange 2007 hidden attachments - gsmik

One of our BI apps (Cognos) sends emails with PDFs attached. After moving
several users mailboxes from Exchange 2003 to Exchange 2007, these users now
receive the messages but the attachments are not visible in the message when
viewed from Outlook 2003. They can see the attachments in OWA, or if they
choose Save Attachments from the File menu in Outlook.

I found one reference to this problem on a blog post that said it would be
fixed in Exchange 2007 SP1, but our servers are already running Exchange 2007
SP1, so obviously that didn't fix the problem.

Is this a known problem? When will it be fixed? Is there a workaround, other
than the ones mentioned above?

Thanks,
Mike