+ 0 Votes It's an issue with the message headers and Mime versions robo_dev 3 years ago Outlook can be picky when it comes to variations in themessage headers,while most smart phones are smarter than that.To clarify, it's not encrypted or decrypted, is encoded or un-encoded. There is a line in the message header that says something like:Mime-Version: 1.0 (Apple Message framework v623)Your problem may be tricky to fix, because the real problem is that the sender of the email is adding something odd to the message header. More specifically, they are sending an email with a MIME encoding scheme invented after 2003. There may be a service pack for Outlook from Microsoft that fixes this. + 0 Votes Reponse To Answer Jacques.Gordon 3 years ago Unfortunately outlook 2003 is patched to sp3 with all the latest updates coming through from my WSUS server. What's odd is that machines running outlook 2003 on xp are not experiencing this problem.