Identify a Meeting Item as a Counter-Proposal to a Prior Meeting Request

This topic shows how to use the named property, PidLidAppointmentCounterProposal, and the Microsoft Outlook object model to identify a MeetingItem object as a counter proposal to a prior meeting request.

In the Outlook object model, all types of items, such as a mail item and a contact item, correspond to specific message classes. In particular, responses to a meeting request can be identified by the following message classes:

• IPM.Schedule.Meeting.Resp.Neg for a decline response

• IPM.Schedule.Meeting.Resp.Pos for an acceptance response

• IPM.Schedule.Meeting.Resp.Ten for a tentative response

However, the Outlook object model does not provide a means to identify a response as the fourth possible response to a meeting request, which is a counter-proposal. Using the PropertyAccessor object and the PSETID_Appointment namespace definition of PidLidAppointmentCounterProposal, you can program within the object model to distinguish all responses of a meeting request item. The following code sample in C# shows how to get the property value given a meeting item. Note that in the code sample, the named property is expressed as:

"https://schemas.microsoft.com/mapi/id/00062002-0000-0000-C000-000000000046}/8257000B"

where {00062002-0000-0000-C000-000000000046} is the PSETID_Appointment namespace and 8257000B is the property tag of PidLidAppointmentCounterProposal.

private bool IsCounterProposal(Outlook.MeetingItem meeting) 
{ 
    const string counterPropose = 
        "https://schemas.microsoft.com/mapi/id/{00062002-0000-0000-C000-000000000046}/8257000B"; 
    Outlook.PropertyAccessor pa = meeting.PropertyAccessor; 
    if ((bool)pa.GetProperty(counterPropose)) 
        return true; 
    else 
        return false;  
}

Support and feedback

Have questions or feedback about Office VBA or this documentation? Please see Office VBA support and feedback for guidance about the ways you can receive support and provide feedback.