How to switch off "propose new Time" on a Meeting with CDO?

Posted on 2003-11-28
Medium Priority
Last Modified: 2008-01-09
Does anybody know how to programatically switch off the button 'propose new
time' on a meeting request?
On the Menu 'Action' is a option 'Allow new time Proposals'. Also in Outlook
under Options/Calendar.. is a button to generally switch off the 'propose
new time' button.
I could not find a way to switch it off on my own meeting request created via CDO.

To find this property I sent meetings with the same
User from different PC's. The recipient was both times the same.
On one machine I switched the "Allow new times proposal..." option off, and
on the other I switched it on. Well I got two meeting requests one with the
button and one with disabled (invisible) button.

With Outlookspy I found the Property which switches the Button on the
MeetingRequest ON/OFF:
It is:
PropertyTag : 0x8366 (|ID=0x825)
Value : true/false
Named Property:
Tag num : 0x8366000B
GUID: {00062002-0000-0000-C000-00000000}
Kind : MNID_ID
ID : 0x825A

How is it possible to see on which object this property is saved and change it with
This property must be saved somewhere in the profile and on the message.

I for example checked the Current User object, but this yields to nothing.
There are 34 properties but not a property 0x8366 or 0x825A.
Is the Conversion from 8366000B to -2090467317 correct? (see code below)
Any help really(!) welcome

Code sample(c#):
AddressEntry rcpt_ae = (MAPI.AddressEntry)mapiSession.CurrentUser;
Field fld=null;
string str="";
int count = (int)(((Fields)rcpt_ae.Fields).Count);
int counter=0;
//check every field of the ddress entry of the recipient
for (int i = 1; i <= count; i++)
//PropSet1 (must be converted see Q195656)
fld =
if(fld.ID.ToString()=="-2108030965" || fld.ID.ToString()=="-2090467317")
{ //Test Property found
fld.Value = this.chkSMRProposeNewTime.Checked;
rcpt_ae.Update(true,true); //this is critical!!!! do not remove!

P.S. If you VB Code it's ok too.
Question by:alesch
  • 2
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LVL 24

Expert Comment

ID: 9838865
u can try to check this link for some clue/hints.


also 8366000B convert decimal to 2204499979.

Author Comment

ID: 9842563
Thanks for your answer

At first sight I didn't get a hint. But surely intersting. Well, I know how to set a property, the trouble is, I havn't found a CDO object which contains this property (neither -2090467317 nor  2204499979. )

Where is it? On hidden Objects? Not accessible through CDO?


Accepted Solution

alesch earned 0 total points
ID: 9850573

Sometimes it's easy.....this works:

calendar = (Folder)mapiSession.SessionObject.GetDefaultFolderCdoDefaultFolderTypes.CdoDefaultFolderCalendar);
messages = (Messages)calendar.Messages;
msg = (AppointmentItem)messages.Add(Missing.Value, Missing.Value, Missing.Value, Missing.Value);
msg.ResponseRequested=false;  //supress Response requested.

If you agree, I ask for deleting this question since I found it by myself by checking out the CDO documentation.
LVL 24

Expert Comment

ID: 9864584
Sure.  Glad u got it working.

u can request for the delete.

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