Eu encontrei este tutorial:
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Passo 1: Criando seu modelo HTML
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Etapa 2: Como colocar seu modelo no Outlook
Once you've built your email template as an HTML document with all of its images and styles you'll need to open that HTML template in Internet Explorer. Once you have it displaying in IE you'll need to send it to Outlook. You can do this by opening IE's File menu and selecting Send. Hovering the Send option will give you the option of sending it as an email. Clicking this will open your new template in an Outlook Email window.
- Etapa 3: salvando seu modelo
O ponto / armadilha está no passo 3:
First you must File > Save. Wait, you're not done. Once you've saved the email you can then save the email template. Now you must File > Save As. Select the save as Outlook Template option in the selection list that appears in the dialogue that opens. You have now saved your template and can now use it.