Chapter 13. Extended Properties
Although there are a large number of useful properties exposed on the item and folders types that you have seen so far, there are times where you need to access properties that Exchange Web Services did not expose. That is precisely why extended properties were added to Exchange Web Services. So, just what is an extended property? Considering the name, it would be reasonable to conclude that such properties are in addition to some set of "common" accessible properties. That is partially correct. Or it may be reasonable to deduce that extended properties are an extension of existing properties. Maybe.
When the Exchange Web Services team first started writing specification documents for extended properties, they called ...
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