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Microsoft Visual Studio 2015 Unleashed, Third Edition by Mike Snell, Lars Powers

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Creating Outlook Form Regions

Let’s turn our attention now to Outlook. As previously mentioned, Outlook has a unique extension point that is not available or relevant in Word or Excel; Outlook add-ins are capable of implementing form regions to any message class within Outlook. A message class is best thought of as the various entities that Outlook defines. These include notes, tasks, email, and so on. Put simply, a form region is the principal mechanism for developers to implement custom form fields within an existing form (for example, email, contact, or other custom forms not included in Outlook by default). To continue with the purchase order example from Word, perhaps a purchase order sent by email should have a set of editable fields and ...

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