I'm writing a sync service that syncs appointments between our crm software and exchange server. The lead system is our crm application and therefore there is no need for the attendee to accept a meeting on Exchange side once more. However it seems not to be possible to put a "meeting" in the attendee's calendar without sending a message to the attendee.
If I use
appointment.Save(WellKnownFolderName.Calendar, SendInvitationsMode.SendOnlyToAll)
the meeting appears in the calendar of the attendee, but also a message pops up in his mailbox.
Using this
appointment.Save(WellKnownFolderName.Calendar, SendInvitationsMode.SendToNone)
will not send a message but also no meeting appears in the calendar.
I also had a look at "StreamingNotifications", but it seems that the message will be placed first in the users mailbox and then the notification event is raised. So handling the message after the user is already informed that there is a new mail, will not be an option. It might even confuse the user.
Does anybody can give me a hint how to accomplish this task?