Outlook AppointmentItem LastModificationTime不更新

Question

I'm currently working with Outlook 2013/2016. My Outlook account is linked to a Zimbra server (I try it with an ActiveSync server but with the same result).

Here are my steps :

1. When I create an appointment, the LastModificationTime property take the current dateTime value => OK

2. On the Zimbra server the new appointment appear => OK

3. When I move my appointment in Outlook, the LastModificationTime property take the event dateTime value => OK

4. On the Zimbra server the appointment have been updated with the new date => OK

5. When I move my appointment in Zimbra, the appointment move on Outlook => Ok. But when I'm reading the LastModificationTime property, it's doesn't change with the new value (last event or last synchronisation between Outlook and Zimbra).

For my application (Outlook AddIn) I use this property, so I need it to be updated. I try to use the update/create event on appointment to change the LastModificationTime but it's not good for the moment.

Do you have any idea or suggestion ? (use other property perhaps).

Thks

Answer 1

I confirm you, the value doesn't change :

https://msdn.microsoft.com/en-us/library/gg156895%28v=winembedded.70%29.aspx?f=255&MSPPError=-2147217396


Outlook.PropertyAccessor propAcc = itemOutlook.PropertyAccessor;
DateTime outStrDT = propAcc.GetProperty(@"http://schemas.microsoft.com/mapi/proptag/0x30080040");