We have a customer that is having trouble with PDF attachments on his iPhone. What happens is a report is generated and printed by an LOB app. The document is then scanned to e-mail (PDF) and sent via an external SMTP to a company mail account. The company is using Exchange 2003 currently (we will be upgrading them to Exchange 2010 soon). The message has no Subject when sent but we created a whitelist entry for the sending printer. The iPhone is set to pick up the customers e-mail from the Exchange server. The customer states that he receives the message and the attachment is there but when he tries to open the attachment approximately half the time the attachment is blank. If we open the attachment in Outlook or OWA though, the content is there. The other point to this is that this only happens on internal company mail. When he receives PDF's from external companies/people there is no problem with the content.