Enabling Virtual Vault using registry values

Hello,

I work in an environment with 5000+ computers.

We are doing a rollout of Windows 7 using SCCM2012 and Outlook with the Vault add-in.

When doing this, the Virtual Vault most of the time is not visible in the Outlook navigation pane.

What can we do to make this happen or what registry values make that it's enabled?

Thanks in advance.