Forum Discussion
Kazzan
Feb 09, 2017MVP
Disabled TNEF and messages with PDF still arrive as winmail.dat
Hello, some of our customers and our users using Office 365 start see after last builds Office 2016 strange things about sending e-mails with PDF attachments. Outside world complain, that they re...
RJBenish
Apr 08, 2025Copper Contributor
With my 2021 MacBook Pro (OS 12.7.5), after sending hundreds of .jpg and .pdf attachments via Outlook v 16.89, I discovered (by sending to myself, another email account that I access with Thunderbird v 115.5.1) that if my recipient also uses Thunderbird as on my system, they receive a useless winmail.dat file. I've found lots of others grumbling about this, and lots of purported fixes, but either they don't work for me or the instructions read like gobbledegook. Please help.