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Returns the data necessary to rebuild the current collapsed or expanded state of a categorized table.
The IMAPITable::GetCollapseState method works with the IMAPITable::SetCollapseState method to change the user's view of a categorized table. GetCollapseState saves the data necessary for SetCollapseState to use to rebuild the appropriate views of the categories of a categorized table. Service providers determine the data to be saved. However, most service providers implementing GetCollapseState save:
The sort keys (standard columns and category columns).
Information about the row that the instance key represents.
Information to restore the collapsed and expanded categories of the table.