2.1.24 [RFC6047] Section 3, Applications MUST Support Signing and Encrypting text/calendar

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The specification states, "Compliant applications MUST support signing and encrypting 'text/calendar' body parts using a mechanism based on S/MIME [RFC5750] [RFC5751] in order to facilitate the authentication the originator of the iCalendar object...."

Outlook does not support signing or encrypting iMIP messages and cannot process signed or encrypted iMIP messages. E-mail messages with .ics attachments that are signed and/or encrypted can be created and rendered properly.