The default public folder archiving settings are set on each public folder. These are the settings that you specified on the Archiving Rules and Archiving Actions pages of Exchange Public Folder Policy properties.
Using the Enterprise Vault User Extensions for Outlook, only users with Owner access to public folders can customize these settings.
To apply archiving settings to a public folder
View the public folder using an Outlook client that has the Enterprise Vault User Extensions installed.
Right-click the public folder and click Properties on the shortcut menu.
Click the Enterprise Vault tab.
The Enterprise Vault property page shows the folder currently has no settings.
The Change Enterprise Vault properties dialog box is displayed.
Select the settings you want to apply.
Users will be able to apply custom settings to a public folder only if the settings on the Archiving Actions page of the public folder policy's properties are not locked.