Вот что ответил support.microsoft.com
http://support.microsoft.com/kb/954684
и еще
Steps to change the 'PR_ATTACHMENT_HIDDEN, PidTagAttachmentHidden' value using
MfcMapi:
Download and install MFCMAPI from the following link
http://mfcmapi.codeplex.com/
1. Launch MFCMAPI
2. Go to Session->Logon and Display Store Table
3. Select your profile (Ensure Outlook profile is configured in online
mode)
4. Select Mailbox
5. Expand "Root Container"
6. Expand "Top of Information Store"
7. Double click "Inbox" and select the message in question-> Right click
and click 'Display attachment table'
8. Select the attachment and in the lower pane double click
'PR_ATTACHMENT_HIDDEN, PidTagAttachmentHidden'
9. It is set as True, we have to remove the check mark to set it as
False.
10. Close MFCMAPI , Close and Reopen Outlook -Now we can see the attachments
Всем счастливо!
Вопрос закрыт!