Unless you specify otherwise, your vault is not accessible to other users. Only you can store items in your vault, search for items in it, and restore items from it. However, you can grant other users access to your vault or to selected folders in the vault. To do this, you must set access permissions on your Outlook folders. Enterprise Vault then automatically applies the same permissions to the folders in the vault.
To share the items in your vault
In your mailbox, right-click the required folder and then click Properties.
Click the Permissions tab, and then add the user to whom you want to give access.
Assign the required permissions to the user as follows:
If you give another user delegate access to your mailbox, you may want to let the user archive and restore items. If so, you must give the user Editor permissions on the folders in your mailbox.