One "iceberg" type of development is Office. If you aren't doing any of it, you may not realize how many developers are integrating into Office. For instance, I was shocked to discover how much is done with SharePoint.
The majority of developers I know do not program against Office, and the ones who do use it mostly for simple utilities like an Excel macro here and there. I have not worked against Office in a while, but I did have a job a while ago that was a lot of Excel programming.
With Office 2013 launching, Microsoft has added some interesting new twists on Office development that may spur additional interest in it. I'd like to learn about whether readers are integrating into Office.
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Justin James is an OutSystems MVP, architect, and developer with expertise in SaaS applications and enterprise applications.