A Table contains rows and columns, where rows represent items in a folder, and columns represent item properties. When you call Folder.GetTable, you obtain a Table object that has a small pre-defined set of columns corresponding to properties common to default items for that type of folder. Similarly, when you call Search.GetTable, you obtain a Table that has columns corresponding to properties common to default items for all folder types. The pre-defined sets of properties are explicit built-in properties. The small size of these sets allows the GetTable call to perform relatively efficiently.
The following tables list the set of properties returned by GetTable for each type of folder or a search folder. Properties are stored as a 1-based array in a Columns object.