Apple iOS 8.0.2 cannot open jpeg files. Only opens winmail.dat
This is a symptom of Outlook sending incorrect formats to Internet-based e-mail addresses. It's been a problem for many years. Have your IT staff look into the problem here:

https://support.microsoft.com/kb/958012

If you're the only one who is receiving these wonky mails, it could be that your entry in Contacts is forcing the supposedly not an RTF problem to be exactly an RTF problem. It can be checked in Outlook:


Open that specific contact by double clicking the item in the Contacts folder.
Hover on the email address of the contact and an Address Card pop-up will become visible.
On the right side of the contact card you’ll see a menu button. Click on it and from the list choose; Outlook Properties.
Make sure that the “Internet format” is set to “Let Outlook decide the best sending format”.


Let us know how you get on with it. It can be a pesky problem to sort out.