2.2.128 [RFC5546] Section 3.4.5 CANCEL

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V0256:

The specification describes the use of CANCEL with VTODO components.

Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016, Microsoft Exchange Server 2019

Microsoft Exchange Server does not export VTODO components. Microsoft Exchange ignores VTODO components on import. For CANCEL-type iCalendar objects, the import fails.