Status:
New
It is not possible to change the MessageClass or create a message with another MessageClass
It is not possible to change the MessageClass or create a message with another MessageClass like IPM.Post
When I do it via SingleValueExtendedProperties = "Id ='String 0x0001A' Value='IPM.Post'"
I am getting the error "Operation would change object type, which is not permitted."
In EWS it was possible when creating a new item.
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