Q: Cannot view the history thread of the email forwarded by iPhone

Hi

I have a weird email forwarded by one user from his iPhone. The history of the email thread is NOT visible from the recipient's outlook client and OWA. However it is visible from the sender and recipient's iPHONE.

The environment i have are;

1. Exchange 2013 CU12
2. Outlook 2013
3. iPhone running on iOS 9.3.4

Did anyone encounter the similar problem before?

Microsoft Technet forum doesn't help because the active sync client is written by Apple.

Regards

Lin