Outlook Pictures Missing

We have a problem where picture attachments in certain emails are missing in Outlook 2003 or 2007 on multiple PCs.  There is no blocking of the attachments as far as I can tell, security settings are bumped down and there is no red X, notification of blocked attachment, or anything like that.

The messages don't show an attachment in the header, it looks basically like a plain text message with the "attachments" part not showing.  The message size however, shows that there must be an attachment (600+KB).

However, if I look at it in Outlook Web Access, it shows the pictures.  The same if I forward it to my external web email account.  It works everywhere except on Outlook 2003/2007.

We've added the sender to safe senders list, tried to view the message in "internet zone", and changed every option that I can find, but can't get these pics to show.

Has anyone else seen this?

Thanks in advance,
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Do you have a third party spam filter that might be stripping the attachments?  Or a Anti-Virus program set not to allow .jpg files?
taftelectricAuthor Commented:
No, I've disabled Symantec as a troubleshooting step, and double checked Outlook add-ins to make sure there isn't anything else.  We do have a spam filter (Barracuda) but the message is viewable through Outlook Web Access after passing through the spam filter.  However the attachments are missing if we open the same message in Outlook 2003/2007 from the same server and mailbox.
Dan KennedyBusiness System AnalystCommented:
Is it a corporate logo attached to all of your messges?

Does it seem to affect some PC, but not all?

Have a look at your secure temp files...

By design, outlook blocks certain attachments.  For a complete listing, go to Outlook help and search for Blocked Attachments in Outlook.  

Would some of your attachments be included with these extensions?

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