The error is not related to winmail.dat's content type, but rather to a content type of one of the attachments that are inside the winmail.dat (TNEF) message in one of its PR_ATTACH_MIME_TAG properties. It is most likely invalid (which would make this not a bug), but we can easily work around it by using the 'application/octet-stream' media type instead. We'll include this workaround in our next release. Thanks for letting us know about this!
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Answered: Invalid TNEF Message
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