Open Winmail.dat in Thunderbird - Import Winmail.dat File to Thunderbird
Thunderbird - disable unread messages auto-read feature or setup a delay
winmail.dat is no longer converted properly and the contents are no longer displayed as attachments · Issue #85 · TB-throwback/LookOut-fix-version · GitHub
Open Winmail.dat to Thunderbird with Actual Folder Structure
Open Winmail.dat in Thunderbird - Import Winmail.dat File to Thunderbird
Winmail.dat Reader and Saver - Microsoft Store Applications
Outlook is Sending Winmail.dat Attachments
popstate.dat files | Thunderbird Support Forum | Mozilla Support