I noticed an issue when deleting appointments, where notifications are not sent if the appointment has an attachment. Tried with the most recent version 8 available on the site and the version 9 release. Using EWS against Exchange 2016. If I make an appointment with attendees, when I cancel it I get prompted whether to send notification, and this will send the notifications. But if I do the same process, but add an attachment to the appointment, it prompts me whether to send notification, but never sends the notification of cancellation to attendees. From the eM Client logs:
When deleting a meeting with no attachment the client sends:
<m:DeleteItem DeleteType=“HardDelete” AffectedTaskOccurrences=“AllOccurrences” SendMeetingCancellations=“SendToAllAndSaveCopy”>
When deleting a meeting with an attachment the client sends:
<m:DeleteItem DeleteType=“HardDelete” AffectedTaskOccurrences=“AllOccurrences” SendMeetingCancellations=“SendToNone”>
Is there some difference about how they are handled if there is an attachment?