FormRegion.InternalName Property (Outlook)
Returns a String that represents the internal programmatic name of the form region as defined in the manifest for the form region. Read-only.
The internal name is required for a form region. The <name> tag in the corresponding form region manifest XML file maps to the value of the InternalName property. For more information on the XML schema for form regions, see the Microsoft Outlook 2010 XML Schema Reference in the MSDN Library.
The value of the InternalName property is used by the add-in or Microsoft Outlook to refer to the form region, for example, to determine which form region is being loaded or to load strings from the localized string resources. The InternalName property supports only ASCII characters. The string is case-insensitive, and its maximum length is 256 characters.