We are running Exchange 2003 with Outlook 2003, 2007 and 2010. One of our vendors sends us a PDF attachment to both myself running 2010 and another user running 2007. I get the attachment but he does not. Even if I open his E-mail in OWA the atttachment is not there. I have looked at my firewall settings, GFI settings and cannot find any clue as to what is causing it. It is only from certain outside people as he can get PDF attachments from other people. Any help would be much appreciated.