Office 2010 / Exchange 2010 - Attachments in EML-Emails are invisible

Question

We are investigating a problem that seems to pop up with Exchange / Outlook 2010.
This is the absolutly the same problem that Clemens Wunder wrote about in his tread:
http://social.technet.microsoft.com/Forums/en-US/outlook/thread/afce3bd0-f8a4-419b-986a-0560ebff5f8f
Problem:
We got several eml-files in a Management System and those have attachmentes (word, pdf whatever) included.
If i open those EML Files in Outlook 2010 (this works if the Registry is apropriate) the Email is opening but the Attachments are "invisible"...
If i now save the Mesage from within Outlook 2010 as a MSG File and open this one the attachments are back...
I searched for bout one week now for a solution but i still don't get it why this should be happening.
My Specs:
- Windows 7
- Outlook 2010
- Exchange 2010 (migrated from 2003)
Fact:
The same problem seems also to happen with Outlook 2007 and 2003 since the migration of Exchange 2003 to 2010.
Those EML Files are from within a data management system and are stored as eml since bout 4 years.
Please don't send answers like "Use Windows Mail" - this is not a solution for this matter because I can't.
Exchange / Outlook is used at every customer of our company so WM can't be the solution...
Thanks for your advices and tips
Roman

Answer 1

Hi Roman,
To make sure I understand things correctly…..
You have EML files generated by another program. Emails have one or more attachments.
You have copied the EML files into your Outlook 2010 profile’s mail folder.
When you open the item in the folder, you have to open or save the item. –You have HKEY_CLASSES_ROOT\Outlook.File.eml.14\shell\Open\command set
to use Outlook 2010 to open the file.
When you open the EML file, the message opens but the attachments are not visible.
In actuality, when you open the EML file, Outlook is saving the file to your “..\..\Temporary Internet Files\Content.Outlook\” location.
To see what Outlook is doing I started a Process Monitor trace,
 then dragged a Windows Live Mail EML message with a Word doc attached over to my Outlook 2010 Inbox.
When I open the eml item, I am prompted to Open or Save the item. I opt for Open and the message with attachment is opened with Outlook 2010.
The trace shows accessing the registry to find out what to use to open the EML file and then it shows the attached file being created in
Temporary Internet Files. The attached file is seen,
but nothing happens to it.
28:14.1 
OUTLOOK.EXE QueryOpen          
jahawk C:\Users\jahawk\Documents\Help me.docx      
FAST IO DISALLOWED    
28:14.1 
OUTLOOK.EXE CreateFile             
jahawk C:\Users\jahawk\Documents\Help me.docx      
NAME NOT FOUND               
28:14.1 
OUTLOOK.EXE QueryDirectory   jahawk 
C:\Users\jahawk\Documents\Help me.docx NO SUCH FILE
From the opened EML file, you click File | Save As | And then save the item as an .MSG file.
When you drag the MSG into your Outlook profile’s mail folder, the mail with attachments is visible.
Looking at the mail folder, the EML item does not have a mail icon associated to it. The item shows no Attachment icon, because it cannot be
read in yet. –You’d need to open the EML file in Outlook to view the message with attachment(s).
Looking at the mail folder, the MSG item is an Outlook mail item and the attachments are showing up.
So, let me ask the following:
How was the item created?
Does this happen with any file that is attached?
In Windows Live Mail, attachments have a lot LESS properties associated to them
Outlook 2010 actually has a PR_ATTACHMENT_HIDDEN property that can toggled to hide an attachment.
What happens from Outlook Web Access? –You will have to right-click “Save Target As” on the attached eml message, first. When you
open the saved “E-mail Message” from the save location, what results?
Is your anti-virus possibly scanning the file? –“..\...\Temporary Internet Files\Outlook.content….”
Anyways, to be honest, I’d have to have a copy of the EML file to be able to (hopefully) explain what is happening.
If I had the file, I would use MFCMapi or OutlookSpy to dump the EML message’s properties after I’ve added it to my mailbox. I’d
then open it and save it as an MSG file type. From there, I’d save the MSG file’s properties off and then compare the 2 sets of properties. And, the item has an Attachment Table that will contain the attached files. Each attachment will have its
own set of properties.
From an Outlook created message with attachment, you could compare the attachment’s properties to the props on the affected message.
From a Windows Live Mail message with attachment, you could compare the attachment’s properties to the props on the affected message.
For the kind of troubleshooting we'd need to do, I would suggest calling and opening a support incident with us. That would allow us to work with you
at a much deeper level. For a case like this, a debug trace of opening the message from in Outlook 2010 would likely be necessary.
Sorry I didn’t have better information for you.
Jahawk MSFT