Office 2013 and later

Last modified: March 12, 2013

Applies to: Outlook

Accesses resources of a Personal Folders file (PST) store provider.

Inherits from:


Implemented by:

PST store provider

Called by:

Client applications

Interface identifier:



Initiates the unlocking procedure for a Personal Folders (.pst) file.

The PST Override Handler Interface Identifiers might not be defined in the downloadable header file you currently have, in which case you will find them in the MAPI Constants topic, and can copy and add them to your code. Use the DEFINE_GUID macro defined in the Microsoft Windows Software Development Kit (SDK) header file guiddef.h to associate globally unique identifier (GUID) symbolic names with their values.

For more information see How to implement a PST override handler to bypass the PSTDisableGrow policy in Outlook 2007.