Outlook 2007 doesn’t show image borders
When we heard from Carl that "Word/Outlook 2007 HTML rendering engine does NOT fully support border styles, despite the official documentation saying otherwise", we ran a quick test of our own. That test confirmed that border styles, either inline or in the head of a document, do not render in Outlook 2007.

Here is how it should look

This is how Outlook 2007 renders the same code
Now that we have at least made contact with Google, it looks like Microsoft should be next on the list! Your ideas and suggestions are welcome. We also love to hear from you when you discover rendering issues like these, because we like to keep our reports accurate. You can email hello at emailstandards.org or leave a comment below.
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Outlook 2007 no reconoce bordes en imágenes - Email standards project publicó hace unos días un artículo informando que Outlook 2007 (si ya de por sí da problemas para maquetar correos) no reconoce bordes en imágenes a pesar que teóricamente se supone que los reconocía.