Finding a CID reference for attachments in Exchange Contacts - powershell

Question

I'm crafting a powershell program using EWS that:
Recover some data from a backup contact folder (telephone, url, notes field,...)
Set back those values in default contact folder in the new contact
Everything does work except, of course, attachents that were added to notes fields, still i'm able to download them.
foreach ($attch in $Item.Attachments)
{
$downloadDirectory = ".\attachments"
$attch.Load()
$fiFile = new-object System.IO.FileStream(($downloadDirectory + “\” + $attch.Name.ToString()), [System.IO.FileMode]::Create)
$fiFile.Write($attch.Content, 0, $attch.Content.Length)
$fiFile.Close()
write-host "Downloaded Attachment : " + (($downloadDirectory + “\” + $attch.Name.ToString()))
}
Or upload them. (it's static here for test purpose)
$att = $item.Attachments.AddFileAttachment("C:\Scripts\myscript\attachments\PowerShell_transcript.20140506143510.txt")
$att.ContentId = 'test'
$att.IsInline=$false
Ideally, i was looking for matching CID references and uplading back attachments using the same one.
<div><font face="Calibri" size="2"><span style="font-size:11pt;">
<img src="cid:0DF540471453B832E300400FF03B0900CFEC1201#1">
SomeDoc.docx
</span></font></div>
Of course, when the object retrieved from exchange, it doesn't have a contentid (I would have guess it should be CID value).
<Objs Version="1.1.0.1" xmlns="http://schemas.microsoft.com/powershell/2004/04">
<Obj RefId="0">
<TN RefId="0">
<T>Microsoft.Exchange.WebServices.Data.FileAttachment</T>
<T>Microsoft.Exchange.WebServices.Data.Attachment</T>
<T>Microsoft.Exchange.WebServices.Data.ComplexProperty</T>
<T>System.Object</T>
</TN>
<ToString>Microsoft.Exchange.WebServices.Data.FileAttachment</ToString>
<Props>
<Nil N="FileName" />
<BA N="Content"></BA>
<B N="IsContactPhoto">false</B>
<S N="Id">AAMkADdmMDBkOTk4LTNlYzMtNDk1MS05ZTdhLWJmOGE.....</S>
<S N="Name">SomeDoc.docx</S>
<S N="ContentType">application/vnd.openxmlformats-officedocument.wordprocessingml.document</S>
<Nil N="ContentId" /> <=== WHERE IS MY VALUE :'(
<Nil N="ContentLocation" />
<I32 N="Size">1764632</I32>
<DT N="LastModifiedTime">2016-01-26T15:08:03+00:00</DT>
<B N="IsInline">false</B>
</Props>
</Obj>
</Objs>
Does someone know a way to retrieve that value ?
Server/mailbox: Exchange 2013 SP1
Thank you !

Answer 1

it doesn't have a contentid (I would have guess it should be CID value).
An Attachment would only have cid if it was on Inline Attachment in a Mime Message https://www.ietf.org/rfc/rfc2111.txt in a contact it would never be valid (eg even the contact picture doesn't have a cid) as your dealing with Exchange Data Type.
Cheers
Glen