public EwsItem DownloadItem(
	FolderId id,
	int index,
	PropertySet properties
)

Public Function DownloadItem ( 
	id As FolderId,
	index As Integer,
	properties As PropertySet
) As EwsItem

Parameters

id

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

index

Type: SystemInt32
The zero-based index of the message to be downloaded.

properties

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

Return Value

To specify the folder by its name, first get its ID with FindFolderIdByShortName(FolderId, String) or FindFolderIdByFullName(String) method.

This is advanced overload which lets you request item parts in the native way of Exchange EWS (via PropertySet obejct). If you just want to dowload a full message with attachments, use DownloadItem(FolderId, Int32, EwsItemParts) overload and pass MailMessageFull as parts parameter value.

Note
In EWS, message indices start from 0 while in IMAP and POP3 they start from 1. Also, the default sorting order in Exchange is "newer first". In IMAP/POP3, "older first" is the default.

Note
This method is not implemented in .NET Core. Use DownloadItemAsync(FolderId, Int32, PropertySet) instead.

Reference