H

hands-off state

A condition in which a form's storage object is unavailable for either read or write access. A form is placed in the hands-off state during a save operation to permanent storage. See also uninitialized state, normal state, no-scribble state. For more information, see Form States.

header folder

A special folder exposed by a remote transport provider. A client application can open the header folder to view only the message headers at the remote message store and decide for each message whether it is worth downloading for reading or can simply be deleted at the remote site.

hierarchy table

A MAPI table object that provides access to the tree organization of a MAPI container. Each row represents the hierarchical position of a container held within the parent container. For example, a hierarchy table is used by message store providers to display the folder hierarchy.

hook

See messaging hook provider.

hook provider

See messaging hook provider.