Are the attachments visible when you access your account through webmail? Do the messages appear with winmail.dat attachments? Are you receiving with a gmail account?

I am not using webmail to view my email. I am using Thunderbird on my laptop PC. The messages DO have winmail.dat attachments. I am not using gmail.

To decode winmail.dat attachments, install this add-on:

https://addons.thunderbird.net/en-US/thunderbird/addon/lookout-fix-version/

To install, drag the Download Now button and drop it onto Tools/Add-ons/Extensions in TB.

https://support.mozilla.org/en-US/kb/installing-addon-thunderbird

To avoid this in the future, you could ask Outlook users to disable TNEF:

http://kb.mozillazine.org/Winmail.dat_attachments#Disabling_TNEF_in_Outlook

Thanks for the information on winmail.dat attachments BUT I am not interested in the winmail.dat attachments. Its the PDF file attachments that are missing. Its the PDF files that I want to receive. How do I get those to show so I can click on them and view them or download them or save them.

The winmail.dat files contain the mis-encoded pdf attachments. Install the add-on to expose the underlying pdf.

I don't have a message with a winmail.dat at the moment, but I've applied add-ons like this in the past to recover the desired attachment.