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2.2.116 [RFC5546] Section 3.2.2.6 Forwarding to an Uninvited CU

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V0259:

The specification states that an attendee invited to an event MAY invite another uninvited calendar user to the event. The invited attendee accomplishes this by forwarding the original REQUEST method to the uninvited calendar user.

Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019, Microsoft Outlook 2021, Microsoft Outlook LTSC 2024, Microsoft Outlook for Windows (new)

Outlook allows attendees to forward meeting requests to uninvited users, but the ORGANIZER property is changed to the calendar user that forwarded the request. Outlook can import forwarded meeting requests.

V0260:

The specification states that if the organizer decides not to add the uninvited calendar user no further action is required, however the organizer MAY send the uninvited calendar user a CANCEL message.

Office Outlook 2007, Outlook 2010, Outlook 2013, Outlook 2016, Outlook 2019, Outlook 2021, Outlook 2024 LTSC, Outlook for Windows (new)

Outlook does not give the organizer the option to send a CANCEL message to the uninvited calendar user. On import, if Outlook receives a REPLY-type iCalendar from an uninvited calendar user, the message is shown to the organizer, but no updates are made to the meeting.