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The TCV Root Index dialog displays the structures present in an index node. Index nodes are "shadow nodes" of folders; named as such because they share the same node index but a different node type. The node type "NIDTYPECONTENTSTABLEINDEX" indicates a TCV Root index. This structure is undocumented, and it's format differs from version to version of Outlook. It essentially contains a stored off version of the previous 5 "views" of a folder. Using this node allows Outlook to at times avoid having to resort (or at least completely resort) a folder when viewing it.

Creating shadow nodes (as well as creating specific subnodes) is a common technique Outlook uses to save client implementation specific data in a PST file. Previous versions of Outlook do not know or care about the existance of such nodes, and ignore them. Future versions of Outlook can depend on a "version" field in such shadow nodes and act appropriately. The TCV Root Index is included as a good example of how and why such techniques may be used.


The top of the dialog contains the header of the root index node.
  • bPlatform The platform on which this index node was created
  • bVersion The version number of the structure shown in this dialog.

Below that is a tree control showing meta information about individual index nodes present. There are at max 5 indicies present. Each entry has the following fields:
  • nidSub The subnode which contains the actual index data. The index data format is not documented, but it is essentially an ordered list of the rows in a TC, along with their version number.
  • tagInst For multivalued sorts
  • cRest The number of restrictions in the sort represented by this index
  • dwRestF CRC of the restriction
  • dwRestV CRC of the restriction
  • lcid LCID of the machine this sort was saved/created on
  • ssos The MAPI sort order set which defines this restriction. This is a fixed size allocation, room for 15 entries in the SOS.

Last edited Apr 5, 2010 at 7:44 PM by terrymah, version 2


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