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2.2.3.2.24 Content-ID

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To set the value of the PidTagBodyContentId property ([MS-OXCMSG] section 2.2.1.58.7), clients MUST write the value to a Content-ID header on a MIME entity that maps to a message body, as specified in section 2.2.3.3. If this value starts with "<" (U+003C) and/or ends with ">" (U+003E), these characters SHOULD be removed. Leading and trailing whitespace characters SHOULD also be removed.

MIME readers SHOULD<135> copy the value of a Content-ID header on such a MIME entity to the value of the PidTagBodyContentId property.

Clients can write either a Content-ID or a Content-Location header, but SHOULD NOT write both on a single MIME entity.