2.2.174 [RFC6047] Section 4.3 Single Component With An ATTACH Property and Inline Attachment
The specification provides a sample message to show how a message containing an iCalendar object references an attached document.
Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019
It is assumed this section is about iMIP messages with the following structure:
Attachment MIME part
Outlook does not export iMIP data with this MIME structure. Outlook can import messages with this MIME structure. However, since the text/calendar part has a Content-Disposition of "attachment", the part is treated as an attachment and is not treated as an iMIP message.