winmail.dat issue

my question is very easy, there are many comments about this issue, and advices of to use winmail.dat third app's viewers or to change rich text to plain text into outllok application

but actually the issue is that some iphones(with latest IOS versión 10.3 and in 2017) receive winmail.dat attachments and others not when the same email is sent from one pc with Outlook aplication and doesn't matter if HTML or txt. Any idea about why in my iPhone doesn't receive it and my fellow does?