How to Disable Outlook from Previewing PDF Attachments

here is step by step video on how to Disable Outlook from Previewing PDF Attachments

https://youtu.be/1kWqPLj3x2A

See if this helps:

Go to File>Options>Trust Center

Click on Trust Center Options button

Select Attachment Handling from options on left.

Turn ON off "Turn off Attachement Preview"

Hi @texastig ,

This is an inquiry that should be asked in the Microsoft  Outlook Support forums, as it is not directly related to Adobe Acrobat Pro DC.

See if the Microsoft Support link below is helpful:

• https://support.microsoft.com/en-us/office/change-the-file-association-for-an-email-attachment-6fa9ac47-4e57-4ab8-9234-2422e3ea507f