The Lync client Microsoft ships has an option to save conversation history into an exchange folder using EWS (Exchange Web Services) which is accessible through a c# managed API. When Lync saves messages in the Conversation History folder using EWS, the messages appear as special conversation items. This is accomplished by setting the ItemType to "IPM.Note.Microsoft.Conversation" -- at least in part.
My question is: How do I get the complete behavior of the Lync-managed Conversation folder if I have to create the Conversation Folder myself rather than relying on Lync to create it? I figured out that I need to set the FolderType to "IPF.Note.Microsoft.Conversation" but this is apparently not sufficient to get Conversation items contained in the folder to display correctly. What other magic is required?