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3.1.4.9.1 Sending a Meeting Cancellation

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The organizer or delegate of the organizer sends a Meeting Cancellation object to inform attendees that they no longer need to attend the event. To send a Meeting Cancellation object, the client creates and submits a new Meeting Cancellation object. The client then copies all properties from the Meeting object to the Meeting Cancellation object, with the exception/addition of those specified in section 2.2.8.

The client modifies the sequence number, as specified in section 2.2.8.

The client sets the following on the Meeting Cancellation object:

  • All the bits in the value of the PidLidAppointmentStateFlags property (section 2.2.1.10) that are set in this value on the Meeting object, and the asfReceived and asfCanceled bits.

  • The value of the PidLidResponseStatus property (section 2.2.1.11) to "respNotResponded" (0x00000005).

  • The value of the PidLidIntendedBusyStatus property (section 2.2.6.4) to "olFree" (0x00000000).

  • The value of the PidLidBusyStatus property (section 2.2.1.2) to "olFree".

  • The value of the PidLidFExceptionalAttendees property (section 2.2.2.3) to FALSE.

  • The value of the PidLidFExceptionalBody property (section 2.2.10.2.6) to FALSE.

  • The PidTagProcessed property (section 2.2.5.7) MUST NOT be set.

  • The value of the PidTagSubjectPrefix property ([MS-OXCMSG] section 2.2.1.9), as specified in section 2.2.8.1.

The following optional properties are also set on the Meeting Cancellation object:

  • PidLidAllAttendeesString (section 2.2.1.16).

  • PidLidToAttendeesString (section 2.2.1.17).

  • PidLidCcAttendeesString (section 2.2.1.18).

  • PidTagStartDate (section 2.2.1.30).

  • PidTagEndDate (section 2.2.1.31).

If the user has not modified the value of the PidLidReminderDelta property ([MS-OXORMDR] section 2.2.1.3) from its default value (as defined by the client), the value of this property SHOULD be set to the LONG value ([MS-DTYP]) 0x5AE980E1.

After successfully sending a Meeting Cancellation object, the client modifies the Meeting object in the organizer's Calendar folder:

  • Set the value of the PidLidToAttendeesString property equal to the value that was set on the Meeting Cancellation object.

  • Set the value of the PidLidCcAttendeesString property equal to the value that was set on the Meeting Cancellation object.

  • Set the ciCanceled bit of the PidLidClientIntent property (section 2.2.2.4) of the Meeting object.

  • If the Meeting object represents an exception to a recurring series, set the ciExceptionCanceled bit of the PidLidClientIntent property of the Meeting object that represents the recurring series for the exception.