Dear August,
Please view my reply:
1. Does the user use Outlook 2011 or other client?
No, user using Entourage, Macbook version.
2. Has he updated his Outlook 2011 to the latest version?
No
3. Does this issue persist in Outlook Web App (OWA)?
No
4. What’s the size of the attachment?
All size
Thanks and have a great day.
Regards,
Andrew Khor