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2.2.3.4.1.4 Attachment Content-Id, Content-Base, and Content-Location

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If a Content-Id header is present on the attachment MIME part, MIME readers SHOULD copy its value to the PidTagAttachContentId ([MS-OXCMSG] section 2.2.2.29) property. If this value starts with "<" (U+003C) and/or ends with ">" (U+003E), these characters SHOULD be removed. Attachment MIME parts with a Content-Id header SHOULD be evaluated to determine whether it is an inline attachment, as specified in section 2.2.3.4.1.4.1.

If a Content-Location header is present on the attachment MIME part, then its value SHOULD be saved in the PidTagAttachContentLocation property ([MS-OXCMSG] section 2.2.2.29). The attachment MIME part SHOULD be evaluated to determine whether it is an inline attachment, as specified in section 2.2.3.4.1.4.1.

If a Content-Base header is present on the attachment MIME part, then MIME readers SHOULD<163> copy its value to the PidTagAttachContentBase property ([MS-OXCMSG] section 2.2.2.29).