public EwsItem DownloadItem(
	ItemId id,
	PropertySet properties
)

Public Function DownloadItem ( 
	id As ItemId,
	properties As PropertySet
) As EwsItem

Parameters

id

Type: ItemId
The ID of the item. Null reference (Nothing in Visual Basic) not allowed.

properties

Type: PropertySet
The settings which specify which portions of MS Exchange items to download (e.g. item ID, mail header, body, etc). If a null reference, only item ID is requested.

Return Value

To get item IDs, you can use DownloadItemIds(FolderId, Boolean) or Search(FolderId, SearchFilter) methods and then pass Id of items of the returned list to the current method.

In advanced cases, you can store UniqueId string in database and later recreate ItemId object using #ctor(String) constructor. Then you can supply that object to this method. This is useful in case if you need to get IDs for items and items themselves at different times.

Note
This method is not implemented in .NET Core. Use DownloadItemAsync(ItemId, PropertySet) instead.

Reference