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My neighbor and I both receive email with attachments on our Macs from our homeowners association that originate from a Windows 10 machine. When sent the same mail, the attachment appears on her Mac as a pdf document, but it appears on mine as a winmail.dat file that I can't open.
What's going on with this and where should I start looking for a solution?
MacBook Air
If you know that the winmail.dat file is a PDF attachment, you can save it as foo.pdf, and open it as you ordinarily would a PDF.
The winmail.dat attachments are not a fault of Apple Mail, but rather a configuration on the Microsoft Exchange server that the Windows 10 user funnels their email through.
There is a free application in the Mac App Store named TNEF's Enough that can handle these winmail.dat files, even when they are not originally PDF files. The application has been available for at least 8 years now.
If you know that the winmail.dat file is a PDF attachment, you can save it as foo.pdf, and open it as you ordinarily would a PDF.
The winmail.dat attachments are not a fault of Apple Mail, but rather a configuration on the Microsoft Exchange server that the Windows 10 user funnels their email through.
There is a free application in the Mac App Store named TNEF's Enough that can handle these winmail.dat files, even when they are not originally PDF files. The application has been available for at least 8 years now.
How to open winmail.dat attachments in Mail
