EV11 - Can't get "Delete from Vault" button to appear

I have EV11.01 installed on Windows 2008 R2.

I have some Citrix servers with Outlook 2010, and the Outlook add-in installed.

I have configured the desktop policy to show "Delete from Vault" and on the toolbar.

The retention category is not set to prevent user deletion.

When i open Outlook, open the Enterprise Vault tab, there is not an option to delete in the toolbar.

When I go to search, there is still no option to delete.

I have tried creating a WebApp.ini file on the EV server with these settings:

BSDeleteButton=1
ISDeleteButton=1

I have restarted IIS, logged on as a user, and deleted the IE cache, but still I cannot get the option to delete from the vault.

I feel like i am missing something obvious.

Any pointers?