you may have come along this as well, that Outlook 2010 and later will out of the sudden not display your images any more in HTML based emails. instead a placeholder with a red cross is display.
Well, stop searching around in Outlook. This is not your source of the problem. It’s Internet Explorer. IE is being used for showing HTML content in Outlook. Rendering happens in the background.
Here’s how to fix your issue:
then goto Tools – Internet Options
Open the Advanced Tab:
Click the Reset button at the bottom:
be sure to select the “Delete personal settings” as well.
Finally restart Outlook and your emails should be showing correctly again.