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Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
Diane Poremsky submitted a new article on Slipstick.com

Outlook is sending winmail.dat attachments

Outlook uses a proprietary email format that only Outlook and Exchange (and a few other clients, including gmail) can decipher. When the recipient doesn't use Outlook, they get plain text message and an attachment named winmail.dat (the attachment icon may be hidden by some clients, including OE and Windows Mail). Any attachments included in the message are encased in the winmail.dat attachment.
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