It has been a while, but I can give you quick heads.
Created a single add-on for Outlook 2007. Between 2003 and 2007, you develop add-ons in different ways. Since the advent of the tape in 2007.
I used WCF to configure web services (a simple API) in my web application. It then connects to this API from an Outlook application. If I remember correctly, the visual studio has a template to use for creating Office add-ins.
I just browsed Google and it was almost 2 years ago. then there was very limited information. Now there must be more.
Hope this helps.
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