[79.08% spam] Forwarded meeting invitation for delegate

Category: MAPI

Hi,
I implemented a store provider - basically it wraps a .pst.
I'm trying to handle meeting invitations that were forwarded to me from another user by the server:
I'm setting the following properties when saving the meeting invitation in Inbox PR_RCVD_REPRESENTING_NAME (PidTagReceivedByName), PR_RCVD_REPRESENTING_EMAIL_ADDRESS (PidTagReceivedRepresentingEmailAddress), PR_RCVD_REPRESENTING_ADDRTYPE

(PidTagReceivedRepresentingAddressType), PR_RCVD_REPRESENTING_ENTRYID, (PidTagReceivedRepresentingEntryId) and PR_RECEIVED_BY_SEARCH_KEY(PidTagReceivedBySearchKey) to the values matching the values of the forwarding user in the GAL.
When I open the invitation the UI shows the correct "Received for xxxx" comment,
But When I try to accept/decline/tentative, I get an outlook error "Cannot open calendar folder for user xxxx", call to GetAssociatedAppointment() fails as well.
I have access to the calendar of the forwarding user and it is mounted in a different store in the profile, But I can't find a way to make outlook look for the calendar in that other store.
In and equivalent scnario in an ms-exchange profile the shared calendar is opened correctly.
Is there some property buried somewhere that can link between the meeting invitation in one store and the calendar folder on a different store?

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