Appointments 'collapsing'

[sasha]

Hello! I hope someone can help me understand how Outlook 'collapses' two
appointments into one. Below is the scenario

1. I send an email from GMail with an embedded meeting invitation.
2. Outlook receives 2 messages (that's what I see in the Inbox). Don't know
why two - whether that's how GMail sends it or the way Outlook interprets the
invitation.
3. Calendar gets a 'shadow' item corresponding to the meeting
4. I accept both items in the inbox.
5. Calendar's 'shadow' item becomes normal.

In effect what happened, the two items from the Inbox collapsed into single
item in the Calendar.
I need to detect this. But my code gets two 'item added' events with
different IDs for the Calendar folder and I know of no way to figure out they
are actually the same.

So, how does Outlook do it?

I'd appreciate any and all information.

Thanks,
..a

 

[sasha]

Hello! I hope someone can help me understand how Outlook 'collapses' two
appointments into one. Below is the scenario

Well, sometimes posting a question helps finding an answer The
GlobalAppointmentID property is the key, not the EntryID.

Hope this will be useful to others

Cheers,
..a