PidTagAttachMimeTag Canonical Property
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Contains formatting information about a Multipurpose Internet Mail Extensions (MIME) attachment.
PR_ATTACH_MIME_TAG, PR_ATTACH_MIME_TAG_A, PR_ATTACH_MIME_TAG_W
If the PR_ATTACH_TAG (PidTagAttachTag) property contains the value OID_MIMETAG, the transport provider should look at these properties to determine how the attachment is formatted.
These properties are copied from the Content-type parameter of the inbound MIME header. The composition of the string is defined in the RFC 1521 document. The format is type/subtype, such as application/binary or text/plain.