can't open winmail.dat in thunderbird why | Thunderbird Support Forum | Mozilla Support
Open Winmail.dat in Thunderbird - Import Winmail.dat File to Thunderbird
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winmail.dat is no longer converted properly and the contents are no longer displayed as attachments · Issue #85 · TB-throwback/LookOut-fix-version · GitHub
Import Winmail.dat to Thunderbird Directly to Read & Open Them Facilely