public Item NativeItem { get; }

Public ReadOnly Property NativeItem As Item
	Get

Property Value

Unlike NativeMessage or MailBeeMessage, this property is available for all kinds of MS Exchange items (including contacts, appointments, etc).

Depending on how many properties of items you requested to download, so many properties will be set in the returned Item object. For properties not loaded, the corresponding Item object properties will throw exceptions. Usually, you need to pass at least GenericItem flag to Ews.DownloadItem(FolderId, int, EwsItemParts), Ews.DownloadItem(ItemId, EwsItemParts) or any other method accepting EwsItemParts parameter. For instance, if you pass just IdOnly, only item ID will be available in the returned Item objects.

Reference