Policy

Permanently remove all deleted content from PST and OST files

By default, a small percentage of deleted data is not overwritten in Outlook PST and OST files. By enabling this setting, all deleted data in PST and OST files is overwritten when users exit Outlook.

Policy

PackMicrosoft Office

CategoryMicrosoft Outlook 2016 / Miscellaneous / PST Settings

Policy ID9da4c130b9a9

Internal nameL_Permanentlyremovealldeleteditems

Registry

Copy registry mappings

HKCU\software\policies\microsoft\office\16.0\outlook\pst\pstnullfreeonclose (enabled) = 1
HKCU\software\policies\microsoft\office\16.0\outlook\pst\pstnullfreeonclose (disabled) = 0

Policy notes

By default, a small percentage of deleted data is not overwritten in Outlook PST and OST files. By enabling this setting, all deleted data in PST and OST files is overwritten when users exit Outlook.

Related policies

Default location for OST filesDefault location for PST filesDo not send meeting forward notificationsLarge PST: Absolute maximum sizeLarge PST: Size to disable adding new contentLegacy PST: Absolute maximum sizeLegacy PST: Size to disable adding new content