Unable to preview hi res jpegs since SP2 installed on 2003 Server with exch

Hi there,

I have a problem with 2003 Server running Exchange 2003, all users that get hi res jpegs cant open via outlook or even when detached from outlook, message = unable to preview.

The problem doesn’t occur if you obtain the jpeg via Yahoo or hotmail to their pc’s so its something in email changing for format.

Any ideas?